gun'sRgood
Member
- Joined
- Feb 16, 2021
- Messages
- 908
While waiting for my adjustable gas block to get here. I've been attending the University of U-Tube and looking for anything else I may have goofed up. Watching guys shim a barrel. One guy cut's the shims and they go inside the upper. OK, but wouldn't this change head space? The other guy puts the shims on the outside of the upper. Which, to my small and ignorant mind, makes sense. Why the difference? Or am I seeing two different things? And by chance, I'm I right about the head space issue? Thank you folks of great knowledge.