. I have place it into various different firearms with diverse calibers starting from seven.sixty two, 9mm, five.fifty six, ect. Its ran flawlessly in every one. I didn't have to swap buffers or springs or everything. Just flip to 3rd posture and he or she's willing to go.. Many thanks https://griffinqhync.ageeksblog.com/35022871/about-rare-breed-trigger