Leaderboard

As mentioned above variations in the un-fired cartridge overall length can effect magazine load capacity difference and has been discussed for many years on this forum. The crimp on the un-fired cartridge is not relevant. The open crimp on the fired cartridge is relative to chamber length dimensions, i.e. 2-3/4" open shell should not exceed this length after being fired or extraction / ejection problems may arise. Comparing one firearm magazine capacity to another is apples & oranges.

The gun rubbed on something or banged something, I know you’re probably disappointed but now your gun is on its way to looking like it actually gets used! I get this is an expensive gun, and I am a bit desensitized to it, since I shoot M4s like the tools they were made to be. Shoot it and enjoy it. Run her hard, enjoy all she has to offer. if it really bothers you you can try some Birchwood Casey Aluminum Black, it might work for you.