06/15/2026
M77 lower rivet hole needed an internal chamfer. We came up with a setup to make it happen. The original 77 trunnions have a tiny chamfer that barely holds the rivet – the rivet just gets squished down to nothing. Ours is actually better. More material, more bite, more secure. In the next video, I’ll show you how to use our tool to install the lower rivet the right way.
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