I'm generally a big fan and supporter of Aero Precision, but this one has me a little disappointed. The bolt catch for the M5 is a bit unique in dimensions such that if you want a guaranteed fit and function you really should just stick with the Aero part. So, you really only have one choice which wouldn't be an issue it was a well made part, but this happened to me yesterday and this doesn't sound like a particularly rare issue. Considering I'm using an AGB and Low Mass bolt, this really shouldn't happen. I doubt the lower even has a thousand rounds on it yet.



Luckily I had a spare so I've already replaced it. I'll contact Aero this week as I hear they'll provide replacements. The mag catch on my EPC also broke after a few hundred rounds but I can's say for sure I used an Aero part for that build, although their LPK mince FC is my go-to anymore.