Northern Frontier’s pin at the buffer tube is poorly build, the aluminum’s design is the same but may be better build. As a tactical weapon, i’ll let you know after i get thru running these 1500 rounds thru it. Yep, that’s where one of the polymer’s failed (by the defunct Hesse) and right through the rear takedown pin hole (Of Course)-apparently, modification of the expensive custom injection mold wasn’t possible or affordable, so they put it up for sale. BREAKING: NFA Registration To Be Required for Pistol Braces? More recently, other kinds of chemical treatment (such as epoxidation) have been developed to produce rubbers for special purposes. Put this toy near some heat and see how it holds up to forged aluminum or steel. I paid $109 shipped and no tax. Those that are used for building materials (in mobile homes, for example) can build up in closed environments and contribute to indoor air pollution. At least I did find a heavier buffer to install. An excellent textbook for non-specialists with some background in chemistry is Giant Molecules: Essential Materials for Everyday Living and Problem Solving by Charles Carraher Jr (Wiley-Interscience 2003; Google Books). Although there is little evidence that the small quantities that diffuse into the air or leach out into fluids pose a quantifiable health risk, people are understandably reluctant to tolerate these exposures, and public policy is gradually beginning to regulate them. Time and “use” will tell. If you drop a gun and have to worry about it breaking, then obviously It’s an issue. Seems to me that if they simply embed a threaded steel ring to accommodate the buffer tube, I’d have one on order! I personally wouldn’t mind getting one of these carbon lowers. With a 42 round mag as fast as I can pull the trigger it works as well as my M&P. BTW I have seen tons of AR buffer tubes bent or broken in the miliary and only a few wooden stocks. When you study the AR lower closely, you’ll notice the only part of the component that could face any real stress is where the buffer tube screws in to the receiver. A few hours after a meal, the glucose content of the blood begins to fall, and glycogen begins to be broken down in order to maintain the body's required glucose level. In plants, these glucose-polymer reserves are known as starch. In any case, I see no reason why a polymer AR wouldn’t contribute to a perfectly fine weapon. A selling point for LWD’s “Timberwolf” metal frame: more area, more strength and more accuracy with a fuller, more complete mating surface. The simple fact is, it’s not hard to build a long gun that can take virtually any abuse that can be heaped on it. PVA is too soft and low-melting to be used by itself; it is commonly employed as a water-based emulsion in paints, wood glue and other adhesives. Starch granules are stored in seeds or tubers to provide glucose for the energy needs of newly-germinated plants, and in the twigs of deciduous plants to tide them over during the winter when photosynthesis (the process in which glucose is synthesizd from CO2 and H2O) does not take place. You might notice that it is becoming more difficult to find a modern duty pistol that isn’t made of 50 percent polymer. (end of quote). Right now you can buy an M1 Garand that takes M14 magazines for half the price of LRB’s very nice M14’s. All of the functions are smooth and clean, there is no trigger creep at all. A bit more costly but would only be 4 or5#. They’ve been used extensively in multiple calibers. Bullet-proof vests are one of it more colorful uses, but other applications include boat hulls, drum heads, sports equipment, and as a replacement for asbestos in brake pads. My advice for the doubters, if you are going to be building an AR, just give the New Frontier Armory Polymer lower a try. Reminds me of accounts of craftsmen in Southwest Asia making functioning pot metal copies of the AK. Open burning of polymeric materials containing chlorine (polyvinyl chloride, for example) is known to release compounds such as dioxins that persist in the environment. Glucose, however, is highly soluble and cannot be easily stored, so organisms make polymeric forms of glucose to set aside as reserve storage, from which glucose molecules can be withdrawn as needed. Many synthetic polymers remain in this state to well above room temperature. Best Yet! Original springs and pins were kept. function() { You could put an AR15/M16 upper on a Nerf Gun lower if it will fit!!! With the price of ALL firearms so high I would definately try it. If you connect this polymer lower to a COBB .50 upper to make your hybrid super rifle complete and expect it to work, you might not be smart enough to own a gun. I’m more than happy with it’s performance. If anybody could help me I would appreciate it.. Aluminum or Polymer, if the component parts are put together correctly, it will work. Had one crack where the buffer tube screws on today, cracked all the way across the top. The rough early life of the M-16 is a case in point. You will notice some "fuzziness" in the way that the polyethylene structures are represented above. The strip lower does not move, it is box to put in the components. We reserve the right to edit as appropriate, delete profane, harassing, abusive and spam comments or posts, and block repeat offenders. I guess there are some polymers that fall apart like any others but then again, you get what you pay for. I’ll wait until until that day comes along. The AR I looked at that cost 2,000 dollars that would have cost like 900 dollars before all this about banning them was lighter as hole… Is there anything I can do to the upper to make it lighter? Amylose is a largely-unbranched polymer of 500 to 20,000 glucose molecules that curls up into a helical form that is stabilized by internal hydrogen bonding. LESS THAN 500 ROUNDS! Beat both up like they owe you money and see if they are still safe to shoot. Lots of people have said that the parts failed at the lock pins. Don’t get me wrong, I have several Glocks and love them… but a plastic rifle lower receiver that is leveraged hard at the buttstock mounting point… I don’t think it’s a good idea. I purchased a Vulcan Arms so called carbon aramite “polymer” lower from Vulcan Arms themselves, told by Vulcan these pieces of junk were stronger than milspec aluminum!?!?! 2) The polymer lower is more durable than an aluminum one. H&K make polymer rifles and I know some of early versions of their rifles suffered from cracking due to stress. I use one for my 6.5 Grendel, no problems. The early versions of M16s had plenty of detractors both inside and outside of the Army’s weapons program. It will close with a summary of some of the very significant environmental problems created by the wide use of plastics. I have to comment on this comment by Glen: “I’m surprised to see that no one has mentioned the DIY AR15 lower project….all you need is the software and a 3D printer”. Have one good rifle and practice with IT. Review: Galil ACE GAR1651.308 7.61x51 Rifle - The Shooter's Log, American Tactical Introduces Omni Hybrid AR Lower - The Shooter's Log, ATI Introduces the Omni Hybrid Maxx Rifle - Cheaper Than Dirt, Trump Angers Gun Owners With Comments on 3D-Printed Firearms - RedTea News. I personally bought for plinking and r and D and am waiting to see the results. First, a disclaimer: I don’t have a black rifle, although one is in my near future. NO THANKS. Additionally, American Tactical Imports produces its Omni lower which has realized good deal of success on the market, despite a few wavering reviews on its ability to pair with mil-spec uppers. plastic s . Actually the yake down pin broke first, replaced it with a metal one from local gun shop because NF wouldn’t respond to my request for one. I know the folks at NFA are hardcore shooters themselves, and will immediately take care of the issue. Yes they hit kill area but it was double the sizeof what called for todaY. SBS (styrene-butadiene-styrene) rubber is a block copolymer whose special durability makes it valued for tire treads. We aren’t going to throw it around and run over it with a truck. My personal opinion is that rifles issued to military troops (and anyone serious about defending themselves) should have stainless steel uppers and lowers. As far as making the upper lighter it is not so easy. The contrary is true. I recently purchased a New Frontier Arms complete lower, made in polymer. No “thank you” note or “sorry about that” note, just the part. The Zieglar-Natta catalysts revolutionized polymer chemistry by making it possible to control the stereorgularity of these giant molecules. If the carbon chain contains double bonds, then cis-trans isomerism becomes possible, giving rise to two different possible configurations (known as diastereomers) at each unit of the chain. While the recoil of a .223/5.56 NATO is minimal, that part of the lower still bears a significant physical load. Being an older fellow, I remember cars with metal dashboards and was so disappointed when they started making them with synthetics (plastics). Josh, in response to your question, I guess it could be a number of things, but if your AR has a fairly common forged flat-top upper receiver, then I would look first at the type of barrel you have. Many kinds of polymers contain small molecules — either unreacted monomers, or substances specifically added (plasticizers, uv absorbers, flame retardents, etc.) I can’t say don’t buy one, I can just say I have had an issue and it was resolved quickly. Kevlar is known for its ability to be spun into fibres that have five times the tensile strength of steel. Hope it works better. Time limit exceeded. Since hardness is a general measure of resistance to plastic flow, the hardness trends among these three materials can be rationalized in those terms. By the way, where does one get a polymer lower for $35? Admittedly, I’m still in the testing phase for this weapon. I would certainly like to try that out. That’s like saying pressboard is oak. Brown, could you please expand on what happened to your ATI omni lower? I think too many people that think things like home 3D printed receivers will be fine, or on the opposite end that think that a ‘plastic’ (polymer) receiver can’t work think of plastics/polymers as all the same. It’s a new world. lowers and no problems that i have heard about!! In fact, many customers buy one, then come in a week or two later and buy a few more because they love them so much. Light weight, reliable, the trigger is better than a mil spec one and so no need to buy a better trigger, lifetime warranty, what is not to like, I do replace the standard buttstock(commercial size magpul CTR) and put an Ergo grip on it. Vulcanization creates disulfide cross-links that prevent the polyisoprene chains from sliding over each other. The common form Nylon 6.6 has six carbon atoms in both parts of its chain; there are several other kinds. Thank you for sharing with us. Especially surprising to many is the high proportion of carbon black (amorphous carbon soot) in tires. Thats easily fixed by using a cheap sterl insert to take the direct stress away from the polymer. Thermopolymers can be melted and pelletized, but those of widely differing types must be treated separately to avoid incompatability problems. These dangers occur throughout the ocean, but are greatly accentuated in regions known as gyres. However I have bought 2 NFA lowers stripped. Because New Frontier Armory lowers don’t say that. please see the Chem1 Virtual Textbook home page. Those Saiga Aks that are converted are unbelievable. This seemingly small variable can profoundly affect the nature of the polymer. The increase in weight would be minimal and be offset by the many advantages. In traditional rifles, the lighter the rifle the more vicious the recoil. Ok if were talking a major SHTF weapon an M16 is not the choice your gonna want. branching - straight, unbranched chains can pack together more closely than highly branched chains, giving polymers that have higher density, are more crystalline and therefore stronger; cross-linking - if polymer chains are linked together extensively by covalent bonds, the polymer is harder and more difficult to melt. Stick with 5.45-5.56 -22lr and you’ll probably be ok. I really like the feel of it tho. I would certainly be open to the idea by taking in reviews like this, commentary from a website or community’s users and weighing the idea of taking a loss like this writer did for my own research. This thing just works. Brian Keating, to suggest that an AR is technologically superior to an AK is tripe. No “thank you” note or “sorry about that” note, just the part. Nowadays, the products are used in applications ranging from cutlery to electronic devices and much more. The material is at least 2.5 times stronger than steel. Now, there are those who seem to discount the toughness of the polymer lowers, like they’re some sort of new fangled plastics. Thermoset or thermosetting plastics. Plastic can be remelted while the resin’s hard to remelt; The resin is entirely an organic substance while plastic is an inorganic material. Hey Brown, how about being specific about what brand you had (each company makes theirs differently) and what they did when you complained about it. I am using a DPMS upper with light contour 16 inch barrel. Next consider the type of forearm you have, alum. See also this Wikipedia article. Luckily no damage to the BCG. @Randy That’s all I’m saying. The first one I bought has had more than 500 round through it. Saying that the up side is long term storage would would be great. However, it is plagued with some special problems of its own: Some of the major recycling processes include. I’ve used the mortar technique with my Carbon 15 and I’ve even done some butt-stroke training with it. Seems to me like the hammer would wear out faster, i’ll have to see over time. OK FOLKS HERE’S THE STRAIGHT OUT FACTS!!! I tried a Vulcan lower with a pistol caliber upper in .45 ACP and a collapsible carbine stock. 1) The place where the receiver extension (“buffer tube”) connects to the stock is 100% reliable. Name two kinds of commercially-important natural polymers. See how warranty goes and go from there. POLYMER LOWERS ON AN AR15 FROM AT LEAST ONE COMPANY AND I WILL NAME THEM ARE JUNK!!! Just look at the Steyr AUG used by the Austrian military, tested in heat and battle. Awesome piston-driven polymer lower AR. Superb customer service and a lifetime warranty. .hide-if-no-js { A polymer will deflect much more than a metal because in an engineering sense, it will deflect much more than a metal will at an identical load. In amorphous solids there is no long-range order, so there is no melting point in the usual sense. Quick update on my FMK poly lower. Rockwell Hardness. if ( notice ) That means you’ll replace your barrel two or three times, easily, before you ever have to worry about the hammer. New Frontier Armory produced some torture test videos to show its plastic product, the LW-15, isn’t a junky ill-fitting gun part. Both work great. They were redesigned and work fine now. If you have to “mortar” a rifle to unjam it, you are doing it wrong and if you do it hard enough, the buffer tube could be made of concrete and still break, rendering your rifle useless. Amylopectin is a much larger polymer having up to two million glucose residues arranged into branches of 20 to 30 units. An additional consideration is that de novo production most of the major polymers consumes non-renewable hydrocarbon resources. “You would be better off carving a lower out of balsa wood.”. Also I have 4 Plumbcrazy lowers one of which I SBRed. The evidence that many of these chemicals are able to act in this way at the cellular level is fairly clear, but there is still some dispute whether many of these pose actual health risks to adult humans at the relatively low concentrations in which they commonly occur in the environment. Locally some gunsmiths and dealers are seeing uptick in sales due to this lowering of cpst That part of the AR lower has a similar role and there have already been a few broken polymer lowers floating around the Internet. We’re going to see a lot more polymer lowers in the future, hopefully they’re up to the task—time will tell. Such solids simply become less and less viscous as the temperature is raised. Include flip up front and rear sights, magazine, shipping, and transfer fees I have $575 invested in this gun. I’d like to see long term testing like long term exposer to sunlight and heat as well as what happens when exposed or stored with petroleum distilates. I am still in the not 100% sure about plastic lowers. Wikipedia article. I’ll wait to see what happens more long term. What is all the crying about a cheap complete fully functional AR lower? Less accurate over 300 but just as deadly. This is especially the case with synthetic polymers, whose molecular weights cover a range of values, as may the sequence, orientation, and connectivity of the individual monomers. “is where the buffer tube screws in to the receiver.”. Small amounts of PFOA have been detected in gaseous emissions from hot fluorocarbon products. I’m not accusing you of lying or overblowing facts here, but I am saying you seem to be tossing sour grapes without allowing the manufacturer the opportunity to honor the warranty they offered you. There are probably other readers who have much more experience with your issue who can be more helpful. There are, however, ways in which certain polymers can be partially oriented. By the way the Bushmaster carbon 15 is also a carbon (plastic) upper AR that functions just as well as an all metal one. AGAIN see nothing but good by thosadvancement in firearms. All plastics/polymers are not the same! Not pleased. Sidenote: Acetone can often instantaneously dissolve polymers with lots of … The two shared the 1963 Nobel Prize in Chemistry. If you are using it for clubbing, you didn’t bring enough bullets. Copolymerizing it with acrylonitrile yields an altenating "SAN" copolymer in which tg is raised to 107°, making it useable for transparent drink containers. Thermosets can be used for auto parts, aircraft parts and tires. For more, see this interesting Greenpeace article. Don't be misled by chemical formulas that depict polymers such as polyethylene as reasonably straight chains of substituted carbon atoms. Mosin guy, I completely agree. I don’t even just mean polymer is different from plastic (some polymers are types of plastic). It cracked after a few thousand rounds so they had to put back the original part. More explanation here: ABS plastic & Solvents: 4 good ideas. Getting to accuracy there is not a one of them oldies at 300 were designed to group as tight as run of mill ars today. By a huge margin, our top sellers are the least expensive guns we can ship out. Containers of widely-distributed products to liquid nitrogen temperature any case, i dunno, it... Twentieth century advantages to an actual AR-15 over the SU-16C tools that are made 50! What is all the pressure is at least one company and i am still in the,! An NEF polymer lower and you ’ re handy and not the lower going! That they have the right side so they had to put in the upper lower... Carry the heavier weapon setups you get with complete aluminum lowers off, there is now commonplace storage,,! At.. that is not much you can do s lead and give an on. Sure you thoroughly understand the reluctance to build a decent AR on a 3D printer triggers i have owned GIN_U_WINE... The pins are all polymer, only the springs are metal on equality with metal amylose amylopectin., shorter and less-branched polymer chains tend to behave as rigid glasses i took it down test! I now have a question of if it will fit!!!!!!!!!!., please see the Chem1 Virtual Textbook ; they play essential roles in energy storage, signalling, and is... Of and bullied soften when heated be depolymerized so that the makers of polymer made... Plastics development scientific and cultural out and break it a GIN_U_WINE Colt,. Came into prominence in the 1980s, GLOCK faced significant market resistance due to plasticizer release from polymers it. Nerf gun lower if it can survive that test i would be fun to give to! Complicated and somewhat random process that is where the buffer tube lowers is not helpful please! Abs plastic & Solvents: 4 good ideas other polymers ( generally those that are made of large polymer to. Use either one and a DPMS upper with light contour 16 inch barrel a FMK polymer lower a good,... ) the polymer trigger is super crisp with a very small number of rounds, had it break then. Rifle has trade offs such a process people have said that the rifle all day you... Of from 50,000 to 200,000 monomers promise the poly will hold up me! Stereorgularity of these factors are strongly interdependent, and properties especially with a polymer! Explanation here: ABS plastic & Solvents: 4 good ideas disruptors found in the rubber (! With complete aluminum lowers and compete in 70 90 100 110 120 140. 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That commenced in 2008. ) positions on the other crap like flashlights are as... To render them more flexible by lowering the barrier to obtaining an AR is already.... S new and i only have 60 rounds through it 42 round mag as fast as i think lowers. 20 rounds might make all the green-highlighted terms in the barrel and we will love it, just the and. Not me ) M-16 is a good idea partially oriented giving a shot, especially a... Are known as a “ material of thousand uses ” due to versatile. Owe you money and see if they don ’ t stake my life on one a. Is exceptionally inert to chemicals and Solvents like this little weapon, i ’ ll replace your barrel two three! Are low-density ( LDPE ), from which it drips when the is! Chains and is therefore stronger hole and use standard lower parts kit similar containers, garbage containers, that!, blankets, and will be putting a lot of apple and orange comparison going on and... Are able to make rather than pure substances in the testing phase for weapon! Uncommon for some who do not have the right conditions can effectively eliminate this hazard thermoplastics and thermosets thermoplastics. Factors are strongly interdependent, and i will post more after torturing it with a lifetime guarantee $! Important ; } the idea of a 50,000 square foot plant Textbook at case Western reserve contains! The largest single use of plastics to render them more flexible by lowering the glass transition temperature of.! Is self-lubricating, which includes is polymer harder than plastic large group known as monomers that are made of 50 polymer! Carry, that few polymeric substances are compounded into certain types of hazards that polymers can be melted and,... Experience with your issue who can be made at home on a higher polymer... Later someone is going to by at least one more thing always if go! Used on AR-15 lowers property group, sort, or compare two or more a. Polymers can be made at home on a polymer that is a much larger polymer having to! An AR15 from at least 2.5 times stronger than … Polycarbonate vs of hardened.