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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.
LNIB 60 rounds fired
Magpul gray hand guards
Magpul gray pistol grip
PSA black butt stock (included original black grip and hand guards)
Takes AR PMAGS
Last round bolt holds open
PM’s ONLY PLEASE
Buyers pay transfer
Barrel Length: 16"
Cash sale in the Oregon City area for a Polymer 80 Spectre 80% Multi-Caliber Pistol Frame kit. Includes the 80% lower, locking block, jig, milling bits, 50rnd box of Herter’s 115gr 9mm ammo, one Glock 17rnd mag, and all the Glock factory parts to complete your build.
This is not a ‘build now...
Sierra Tipped MatchKing (TMK) Bullets 22 Caliber (224 Diameter) 60 Grain Polymer Tip Boat Tail
Box of 500
FTF Fishers Landing Fred Meyer on se 164th Av East Vancouver ///// Or if we can meet up when I'm out and about I like to make easy if I can.
Will ship at cost...
If you want them...
For sale is a Glock 19 Gen 5 with three magazines, mag loader, extra backstraps, brush, paperwork, and box.
Bought new last summer, approx 350 rounds through it.
Real nice and accurate handgun, but I'm finding I don't like striker fired that much.
$450 cash - buyer pays background check and...
Like new shot probably 25 rounds Taurus Judge Polymer FDE in .410ga/.45LC. In virtually perfect condition. Comes with box, original grips and Packmayr grips that are much more comfortable. Also comes with the following ammo:
100 rounds Hornady .410 Tripple Defense
10 rounds Winchester .410 000...
This is the trigger group from a Polymer 80 pistol frame parts kit, part number p80-pfp-fkit. Only what is pictured is what's included. Some of the other parts were used. I decided to go with a glock trigger. This includes a curved and flat trigger. New and unused.
FS: Long-discontinued Tapco SKS stock in great shape w/ pistol grip, comm-spec faux buffer tube and m4 buttstock, bayonet cut. Missing the railed gas tube/cover.
FTF transaction only in the greater Vancouver/Clark area-no shipping. $40 cash or Venmo (no notes on payment!). Please PM me with...
upper - Brownells rmr cut with window
Lower - serialized - bought from brownells
Barrel - don’t remember.
Upper parts kit - rocky brass & Zev
Trigger - Zev pro flat face
Extended take down
Extended slide release - Tyrant designs
Two - 22 round mags
About 500 rounds through it.
Has some trigger...
I have 30 and 40 round AK mags from Germany these are polymer mags with steel locking pieces 30rd $10 ea and the 40rd $12ea just tell me how many you want of each I will drive within reason to meet in the Portland area
I bought these mags from GunMagWarehouse a while back, since then they've been collecting dust.
Great condition, never fired only loaded and reloaded several times.
Not looking to part out or trade, selling both as one unit.
$30 in person otherwise I can ship for $35 tracking provided.
Taurus Judge Public Defender Polymer Black w/ 150+ Rounds
Has Red Fiber optic front sight
140 Fiocchi LRNFP
30 Blazer JHP
Less than 100 rounds through
Can meet at Fin and Feather here in Ridgefield or anywhere in Portland Metro area. J&B Firearms in Beaverton preferred
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...