• It looks like any non-proprietary triggers will fit, but you may want the optional longer pins, just like on the KP15.

  1. OK, that’s cool…..now….do it in a braced pistol lower!!!!!! The ATF should just sign off on whatever you come up with, right?
    I’d need a 9″ pinned and welded muzzle device to make my AR9 upper legal on this lower.

  2. Ian, thank you very much for illustrating some of the clearance issues of the 9mm bolt & the standard BCG.

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