This article should help.
http://www.03designgroup.com/technotes/carbine-vs-mid-length-gas-system
Here's a write up on a BCM ar-15 for you.
http://www.03designgroup.com/reviews/bcm-complete-ar15-upper-and-lower-receivers
A little OT, but here's a pic of a 8,000 metric ton forging press that I operate.
You can see the conveyor on the left where the billet comes out the heaters to the press.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.