SIG Talk banner
300 blackout
1-2 of 2 Results
  1. Ammo and Reloading
    I recently went to purchase some 30 round 5.56 mags for my AR. They didn't have any, but said the Magpul 300 BLK mags will work fine with 5.56 rounds in my M400. Has anyone tried this and is it safe & reliable?
  2. SIG Sauer Rifles
    I'm working up some reloads for my Sister who bought a 300 Blackout version of the MCX. She is not using a silencer. She originally purchased some factory rounds, Subsonic Remington UMC 300 AAC Blackout 220 Gr. and because she is not using a silencer there is not enough pressure to cycle the...
1-2 of 2 Results