. I have put it into several distinctive firearms with distinctive calibers starting from 7.sixty two, 9mm, 5.fifty six, ect. Its ran flawlessly in each. I did not have to swap buffers or springs or nearly anything. Just flip to 3rd position and he or she's able to go.. Thanks https://frt14467.digiblogbox.com/60774027/little-known-facts-about-frt-15