I purchased one of these from Milsig right before Rockstar started carrying them and just recently had the opportunity to put it to its paces. I have an A5 and a Milsig Kseries and was using the marksman in the 12" configuration (the 6" piece just makes it too darn long imo). I was using before a JJ ceramic 12" and I can definitely tell a difference. While not entirely a game changer the barrel did increase my groupings and made my shots more consistant. The barrel also looks very heavy duty and the muzzlebreak looks pretty mean. 5 Stars between the ports, rifling, and muzzlebreak I don't know what else you could want from a barrel.
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