Installed my SF3P-556 on my MK18 tonight. I could not get the flash hider to time exactly straight up and down. I'm slightly OCD about things like this. I'm assuming this won't cause an issue. I tried the purple shim and it would only time with about 15 foot pounds. The next size up is the no-color shim and its with 30 foot pounds. This is whats on there now. I could probably get it to time with 35 foot pounds, but I dont believe that is recommended.
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