I think the 77gr TMK is designed to run in AR mags. Believe the advertised G1 is similar to the A max. I'm running a Marlin X7 of all things. It has a long mag and a super short throat so I can pretty much jam any projectile on the lands if I like. They are slightly over length as is for the mag but I can sand a few mm of the mag block so they feed properly.
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