. I've place it into several distinctive firearms with diverse calibers starting from 7.sixty two, 9mm, 5.56, ect. Its ran flawlessly in each one. I did not have to swap buffers or springs or anything at all. Just flip to third situation and he or she's wanting to go.. Thanks https://frt-triggers45678.yomoblog.com/43015324/the-ultimate-guide-to-frt-15