They have a mfg. or a reseller place an order for a number of rifles to be laser etched or roll stamped or otherwise marked w/ the logo of choice and then "sell" them through said mfg. or reseller and make money off the licensing of the logo.
And yes, you can do something like that to yours. You would need to find a local trophy shop or tool shop w/ an engraving device (in this case a laser) and give them the logo you would like engraved on the receiver.
I was wondering the same too. I guess no buffer and spring? ouch!Lol - I think he's more interested in how, exactly, a folding stock works on an AR15. I, too, am a little confused about this and want to know more!
The spring is where the gas tube should run, like other piston uppers. It rides on the outside of the carrier key piston. I saw it all on ShootingUSA. The little half moon thingy #29 holds it all in place.Ok, I was close. Bolt is abbrivated, but the spring is up in the charging handle.
This is a picture from the YHM ZM instruction manual on the website.