Today I used Tula steel cased 62 grain and 55-grain ammo, along with Federal 55 grain ammo. With the Federal, the bolt locked back without having to make any gas setting changes. With the Tula, five clicks to the left and presto worked perfectly with all 3 types of ammo. I used Gen 2 &3 P-mags, surplus steel mags and Hex mags with no issues except for one of my P-mags which must be a dud because it failed on my AR also, it failed to seat properly on both guns. Other than my one P-mag issue, I experienced no problems at all. I was apprehensive at first about the gas settings but it's super easy to adjust. I've never had any experience with adjustable gas systems until now. The Primary Arms 1-6x scope was fun and easy to set up and made shooting much more enjoyable.
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