07-31-2011, 05:38 AM
gophernuts Wrote:Somebody needs to figure out a polymer mag, like right now.
Buy or borrow a P-Mag. Load it up with Grendel. Try 5, then 10, then 15. You'll see why this is easier said then done. Not that it's impossible, but will be very challenging. Hint: 5 works fine, 10 works, but is tight, 15 does not work, just bulges too much.
Quote:These metal mags are horrible on the brass.
Something is wrong. three different grendels, shooting 12+ 25 round C-prod mags bought at various times from 2008-late 2010. Just never had that problem.
If you are seeing scratches, it's most likely feed ramp edges or edges on the barrel extension. Very common.
If you are getting dents from the bolt/carrier something is wrong, I'd try a different lower and upper to try to fault isolate.
The small dent in the side of the case is due to ejection, and functions as a handy reload count indicator. (But has no other effect)
5.56 brass is usually beat up as well, especially in carbines. But fewer reload 5.56, so most do not notice.