I didn't have any hammer follows the first 500 or so rounds. Seems like it's been doing it more often now. Tried switching trigger and buffer springs, haven't taken it back out yet but will chime in
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I bought one a couple months back for my sig MPX. Worked great 1000rnds. Other day it was double tapping on single fire. Pulled apart and noticed the ids pin c clips were off. Customer service was fast on replies, apparently on the mpx there has been some tolerance issues... fun when it was...