glock block test fire.
thingiverse
well i trust my printing but i not gonna be next to it when i try P+. print with a high wall count like 6 plus and reasonable infill. thru bolt for added strength, and another bolt hole so you mount a bolt to have a place to tie your string to, then mount in a vise. I am not gonna explain this in great detail. if you dont get the general idea.. well this isnt for you.
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