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I installed this in my Diamonback Obsidian AR pistol 556. It did not function correctly and I tried everything. Had a buddy come over to see if I did something wrong on install. He started over and got the same result. Installed it in his S&W sport II. It worked like a champ. I just gave it to him and I kept the handstop. Just maybe thr Diamonback does not like cassette style triggers. Gonna try a Geissele component trigger next to see what happens.
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