I’m not a gun smith, but this is great for small DIY gun projects, like I just put a RMR on my FN 5.7...Had to knock out a couple of pins....paid for itself first use.

A couple of the punches are specifically undersized, which is needed to get into standard size holes.

It’s a cheap kit, I already broke a couple of pieces while doing some simple tinkering with a few of my pistols