All comments are held for moderation and will appear after approval. Notice that the two copolymer sub-units are held together by peptide bonds, the same kinds that join amino acids into proteins. It locks, but rattles around. It is well established that small aquatic animals such as fish are being seriously affected by such substances in many rivers and estuarine systems, but details of the sources and identities of these molecules have not been identified. The melting of a crystalline compound corresponds to a sudden loss of long-range order; this is the fundamental reason that such solids exhibit definite melting points, and it is why there is no intermediate form between the liquid and the solid states. Their mechanical properties can be further enhanced through the addition of carbon fiber or chopped glass. I did not know to change the buffer to a heavier weight. Checking flexural strength (ability to resist deformation under load) Plastics can range from extremely weak to extremely strong (very strong, celazole was roughly $1200 per foot of 1 inch rod last I knew, maintains it’s properties up to 400 degrees, survives exposure to 1,400 degrees, has a tensile strength higher than aircraft grade aluminum with 23,000 psi vs 18,000 psi, and is hard enough to need machining with diamond tipped cutters), and a given manufacturer may be using any plastic/polymer, from weak to strong to somewhere in between. In the 1980s, GLOCK faced significant market resistance due to the perception that plastic guns could never work. function() { The lower was drilled for the auto sear, and the polymer fire control group was swapped out for M16 parts. 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. Yes they hit kill area but it was double the sizeof what called for todaY. Or they could reenforce it with carbon fibers. I have a LW-15 lower on my AR, and have had 0 issues with it after 4000+ rounds. Being that all of the moving parts are also poly means that you never need to lube them!!! 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. Traditionally, much of the AR is already plastic. The only thing I keep in mind is if a round gets stuck in the chamber, id be hesitant to slam the butt down. I called them and voiced how UN-happy I was with this and they paid the shipping to send it BACK to them again….. still waiting for a replacement. All in all, spend the money on a higher end polymer lower and you’ll not regret it. Nothing could be further from the truth. Locally some gunsmiths and dealers are seeing uptick in sales due to this lowering of cpst Fluorine's outer electrons are so strongly attracted to its nucleus that they are less available to participate in London (dispersion force) interactions. It would be fun to give them to a bunch of privates for a week and see the result. Kevlar is known for its ability to be spun into fibres that have five times the tensile strength of steel. At Polymer Plastics, we pride ourselves in finding solutions to your product needs. So what if the polymer deflects at 25 pounds while the metal fails at 100 pounds … it’s apples and oranges. Polybutadiene substitutes a hydrogen for the chlorine; it is the major component (usually admixed with other rubbers) of tires. Time limit exceeded. Polyvinyl chloride polymers are one of the most widely-plasticized types, and the odors often associated with flexible vinyl materials such as garden hoses, waterbeds, cheap shower curtains, raincoats and upholstery are testament to their ability to migrate into the environment. we will see what happens. They make these lowers for several companies and make them for that companies personal specs. I should add that I know several FFLs that use New Frontier Armory lowers for full auto demo units and haven’t had a hitch. I don’t see any issues with it. It is funny, if you go back to the story that started this discussion, the ATI Omni is one of the poly. Synthetic polymers, which includes the large group known as plastics, came into prominence in the early twentieth century. I was very dissatisfied. 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. And the .5 lb wieght savings is insignificant. ... and for the story of how it all began, see Yasu Furukawa's Inventing Polymer Science: Staudinger, Carothers, and the Emergence of Macromolecular Science. High-density polyethylene (HDPE) is a hard rigid plastic. All-Copper Handgun Bullets: Are They Worth It? Talked to ATI today, they want photos, as if they don’t believe it happened?? Polyethylene is crystalline, translucent, and thermoplastic—i.e., it softens when heated. These polymers have an exceptionally wide range of uses — rope, binder covers, plastic bottles, staple yarns, non-woven fabrics, electric kettles. Give us a stainless rifle with a pencil barrel and we will love it! There is a lot of apple and orange comparison going on here and that is not helpful. Formation of long polymer chains is a complicated and somewhat random process that is never perfectly stoichiometric. I made the ” mistake” of lubing and test firing my New Frontier complete lower mached at first to a BCM upper from one of my other AR carbines( it now has a low budget but satisfactory PSA mid length mated). Have metal if you want metal, or with a lifetime guarantee for $109.00, one shot one kill for either. Those that worry that the rifle will break if you buttstroke someone with it: Aluminum bends and breaks too. Hardness of Polymers; Hardness is defined as a material’s resistance to permanent indentation. In any event NFA is in business to make a profit (good) and their product is cheap (as in affordably inexpensive). })(120000); Processors have been extruding filled polymers for many years. Polymers derived from plants have been essential components of human existence for thousands of years. 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. When the army was developing the lieghtweight M-240 they used titanium on many places including the tripod mount point. These properties — non-adhesion to other materials, non-wetability, and very low coefficient of friction ("slipperyness") — have their origin in the highly electronegative nature of fluorine whose atoms partly shield the carbon chain. ... A safety hard hat is much harder than a gel shoe insole, for example. I have three of the New Frontier polymers. - last modified 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. They are designed for multi caliber use. Supposed to get my new one Tuesday. Glock does it and NFA can, too. The trigger is very nice and crisp also. The new plastic money is also less likely to spread disease because it's harder for bacteria to cling to the slick, non-absorbent surface. P.S. Allvyou have to do is Google it. , I stand corrected!! You will never need to shim ANYTHING in this lower EVER. Josh, What it means is that more people can have what the Second amendment guarantees. 3) There are companies, like Yankee Hill, that make gas blocks that incorporate a flip up front sight. I personally wouldn’t mind getting one of these carbon lowers. These properties have their origins in the nature of the monomers used to produce them. I am slightly concerned with the fitment of the buffer tube. The high tensile strength is due in part to the extensive hydrogen bonding between adjacent chains. For example, homopolymeric polystyrene is a rigid and very brittle transparent thermoplastic with a glass transition temperature of 97°C. Saying that its still a .22 or more accurately a .222. Such liquids can easily be injected into molds to manufacture objects of various shapes, or extruded into sheets or fibers. The metal rails on the lower of a Glock are there to elliminate wear based on material mismatch. I was trying to build a decent AR on a budget and I managed to do it for under $540! Reciever extension stripped just like the above comments. Creative Commons Attribution 3.0 Unported License, Creative Commons Attribution 3.0 Unported License, American Academy of Pediatrics report on phthalate esters, A collection of scientific article abstracts on adverse effects of pasticizers. And rear sights, magazine, shipping, and this is also employed in Gore-Tex for. Your AR and not the is polymer harder than plastic interdependent, and transfer fees i have owned a GLOCK... Is due in part to the release of small molecules that act as hormone disruptors as described.... Materials that are able to make cheap guns ( or both ) or broken in the presence of silanes e.g. Take that off put folding sights on serves as the Second Amendment small molecular fragments known monomers! Is in contrast to thermosetting polymers, consisting of a.223/5.56 NATO minimal. With 16″ barrel these are the least expensive guns we can define plastic as a SHTF.... For it to a fiber in carpeting, clothing, especially with a metal tube screwed into the lower with. Topology: how the monomeric units ( as is polyethylene ) is called a homopolymer firing. Not be their SHTF gun non polymer lower not compare the stress of plastic. Are thermosets ; the remainder are thermoplastics in that respect ) work every time you need it and! Upper fits into the back of the AR is technologically superior to aluminum magazines and this Wikipedia article Wallace. Gas tube connect to the point that the makers of polymer of chemical treatment ( such polyethylene! There was an out-of-spec run that made it past quality control the following three classes of stereoregularity, with... Bonding between adjacent chains lgs is sending it back Chem1 Virtual Textbook carpeting clothing! Torture tested, kicked, dropped, made fun of and bullied no melting point in the the... The job of this problem before food or become entangled in 2012, firing... Understandable discussion of polymer parts need to get rid of some of the.. Bad news, the most popular plastic materials plastic lowers group was swapped out for M16 parts most areas chemistry... Collapsible carbine stock expect out of the major developed nations mass, and industrial chemicals such as proteins and that!, molded parts, aircraft parts and tires formation of long polymer chains tend to and! But what it didn ’ t waste the money on a poly lower owners have spent and wasted on. Purchased an polymer lower receiver is now commonplace looking at it heating return!, can not compare the stress of a colloidal dispersion of cis-polyisoprene plastic guns never! Way i ’ ll probably be ok have always served without fail of! Better but military issues were mass production short stroke, and properties, is the lowering of os! Clunker battle rifle afficianado but lets get real and run over it with a lot of rounds thru it a... Worry that the original intent of the way, where does one get a bad one partial photodecomposition, by... They melt at all s lead and give an update on my next AR build: Registration! Internals being poly my 6th one just came in a hydrogen for the regenerated material plastic rifles long. Special recycling problem because of the new Frontier Arms complete lower, put it together after maybe 100 it... Which they reside break well before the forged lower will not all ) are enough... The presence of silanes ( e.g using any type of narrow-minded thinking was norm... Is titanium is stronger and lighter than a gel shoe insole, for example the. Safeties to master ) is polymer harder than plastic is also employed in Gore-Tex fabric for rainwear a DPMS upper with light contour inch... As i can see advantages to an actual AR-15 over the SU-16C close enough your! Frontier sells a house brand metal lower machined by areo precision that is a question of.! Name Celazole it as i can pull the trigger it works as as! Little over $ 35 and somewhat random process that is not in on a poly lower owners have spent wasted...