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  1. P250, P320, P320 X-5, M17, & M18 Pistols
    I have a Sig M18. I just purchased a Surefire X300U-A. It came with the “U” mounting plate installed. When I slide it onto the rail, it won’t go all the way back and lock in. The battery door is hitting the trigger guard. Should I be using one of the other mounting adapters the X300 came with or...
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