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polymer
A polymer (; Greek poly-, "many" + -mer, "part") is a large molecule, or macromolecule, composed of many repeated subunits. Due to their broad range of properties, both synthetic and natural polymers play essential and ubiquitous roles in everyday life. Polymers range from familiar synthetic plastics such as polystyrene to natural biopolymers such as DNA and proteins that are fundamental to biological structure and function. Polymers, both natural and synthetic, are created via polymerization of many small molecules, known as monomers. Their consequently large molecular mass, relative to small molecule compounds, produces unique physical properties including toughness, viscoelasticity, and a tendency to form glasses and semicrystalline structures rather than crystals. The terms polymer and resin are often synonymous with plastic.
The term "polymer" derives from the Greek word πολύς (polus, meaning "many, much") and μέρος (meros, meaning "part"), and refers to a molecule whose structure is composed of multiple repeating units, from which originates a characteristic of high relative molecular mass and attendant properties. The units composing polymers derive, actually or conceptually, from molecules of low relative molecular mass. The term was coined in 1833 by Jöns Jacob Berzelius, though with a definition distinct from the modern IUPAC definition. The modern concept of polymers as covalently bonded macromolecular structures was proposed in 1920 by Hermann Staudinger, who spent the next decade finding experimental evidence for this hypothesis.Polymers are studied in the fields of biophysics and macromolecular science, and polymer science (which includes polymer chemistry and polymer physics). Historically, products arising from the linkage of repeating units by covalent chemical bonds have been the primary focus of polymer science; emerging important areas of the science now focus on non-covalent links. Polyisoprene of latex rubber is an example of a natural/biological polymer, and the polystyrene of styrofoam is an example of a synthetic polymer. In biological contexts, essentially all biological macromolecules—i.e., proteins (polyamides), nucleic acids (polynucleotides), and polysaccharides—are purely polymeric, or are composed in large part of polymeric components—e.g., isoprenylated/lipid-modified glycoproteins, where small lipidic molecules and oligosaccharide modifications occur on the polyamide backbone of the protein.The simplest theoretical models for polymers are ideal chains.
Selling 10 of these mags in one go, not interested in selling them off individually.
Only trade I'm interested in are for Bakelites + cash on my end for 2.
To get 10 of these from the importers (AoA or Atlantic) would be 120ish plus tax for Washingtonians.
Will deliver within a short drive...
Polymer 80 PFS9 Suppressor Ready(pretty much a Glock 17 Gen 3 but better frame/grip/ergonomics IMO) in great condition, less than 50 rounds down the 1/2x28 threaded barrel. Everything from the factory and magwell included in the factory case. Suppressor ready with threaded barrel and NightFision...
I have up for sale or trade my 80 percent polymer ar lower. Was saving it for a future build but ended up acquiring another lower and no longer need this. Asking 40 bucks or trade for an upper receiver with possible cash on my end depending on upper.
Brand new PF940C Magwell designed in collaboration with Steel City Arsenal. Perfect for everyday carry, the PF-Series Magwell is precision machined from 6061-T6 aluminum and hard anodized. The wider target area allows faster and easier reloads, and aggressive styling enhances the aesthetics of...
Psa upper-no bcg or ch . Shoots good. Comes with 80% polymer lower and colt Carry handle.
300$ for all.
250$ without carry handle. Or lower
200 without carry handle and lower.
Really just looking for trades. I travel to Portland daily so deals up north are easy.
Selling my new P80 PF940SC frame kit in Cobalt - this is for a sub-compact G26/G27
Asking $70 - comes with the frame / jigs & rails + P80 sticker.
Located in the Tigard / Pacific Hwy area
I have a polymer 80 p940c in fde that I am not going to end up building. I would sell it for $90 or trade it for 308 win ammo. Pm me to keep the thread clean
I have a brand new Polymer 80 RL556 Phoenix V3 80% Polymer AR Lower - Black. In box, unmilled, new bits. Looking to trade for some 12 gauge ammo. 2-3/4” or 3” shells. Located near Tigard, Oregon. 205-299-7961
Up for sale is my full-size (Glock 17 size) pfs-9 pistol. It has seen very little use and will come with 2 17 round magazines and a Streamlight TLR-1HL weapon mounted light. Don’t like the “glock grip angle”? Here is the answer to your question. Cash is king, but a lightweight hunting rifle is...
Can anyone educate me why there aren’t any bull barrels for most modern striker fired guns? Or at least a wide use cases of them? There seems to be a lot play in most of these wonder 9s….I don’t like the way it feels, nor do I like the gap between barrel and slide. (It’s what keeps me lusting...
I have an ATI Strikeforce polymer chassis with an adjustable and folding stock for a Ruger 10/22 in destroyer grey color. I bought it because I have long arms and I wanted to increase the length of pull on my 10/22 from the OEM polymer carbine stock that it came with. I had my 10/22 in it for...
Hogue rubberized pistol grip/lower handguard with aluminum heat shield, polymer buttstock and polymer upper handguard.
$35/obo or trade for a few USGI AR mags, 5.45x39mm ammo