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Fits: AR-15/AR-10/LR-308 .154" pin trigger/hammer pins (Small Pin) Note: Not recommended for use in conjunction with 5.45x39 upper assemblies and some 308 AR's may require a heavier trigger pull to ensure proper functionality.

Hi Duane and welcome. This will fit both the diamond Back AR 15 and ATI AR 15 pistols no issue. Cheers, stay safe and enjoy!

Hi Duane, this fits MIL-SPEC AR-15 and AR-10 style rifles. Stay safe & have a great day!