what is 50s compact yarn?
You need to put down the toys and look at a real gunWhen the cartridge is fired, it is enclosed in steel, the barrel, the barrel extension and boltThe front plastic hand guard only keeps you from burning your handThe aluminum upper receiver just guides the bolt carrier back and forth and gives the lower receiver something to attach to without having to make the barrel hook directly to the lower receiverThe aluminum lower receiver provides a way to connect the butt stock to the barrel (indirectly through the upper receiver) and holds the trigger assembly and magazine in alignment with the barrel and bolt.
Real Steel is a term used by airsoftees to refer to real firearmsFor normal people in the hunting section that term should be omitted, because either you are talking about a firearm or a toy, and toys are discussed in a different sectionThe question you appear to be asking (are you on drugs?) is what is the receiver of the Colt M4A1 made out ofThe upper and lower receivers of a Colt M4A1 ARE machined from forged ALUMINUM alloy (using steel here would be stupid)Use of lighter weight aluminum alloys (along with plastic furniture) was one of the innovations for the M16/AR15, as it is on many metal framed handguns, due to the lighter weightThe barrel, bolt, and bolt carrier (internals as you call them) are forms of steel.
Well, doing an internet search for it, this seems to be a coned, fine spun yarn on the order of lighter weights of perle cottonIt looks more appropriate for machine knitting, although lace could be knit with it by handIt seems that some it, if not all, is of man-made natural fibers like bamboo and ingeo (corn) and soy silk.
