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Same hereI've never had any issue with a properly installed lopro GB, either pinned or screwed.
just looking as compared to an AK, the dual pin A2 FSB looks to be the most solid. I've seem them move around without any dimple / pin before. Not that it caused a malfunction, but you can see it in the grooves the screws dig if you remove the low pro gas block.
I'm a dimpler and screwer. Have always held tight with blue loctite. I recently discovered the blue loctite in lipstick form and feel that it holds better than the liquid.
Dimple the barrel and loctite the screw. Never had a gas block move. To be honest I've never had a gas block move on an undimpled barrel, either.
Then they haven't been shot enough to cause it, I've seen it happen dozens of times.