Patriot Armory 308 made me a solid shim for my Sage setup to replace the front band and time the lock correctly. He made the OD to the diameter I requested so it's the same OD as my barrel. Very nice piece and only $10. I'd say it's worth hitting him up since I wasn't impressed with the supplied crush washer.
It's really a trade off. You actually lose muzzle options but increase front sight options. As far as I know only SEI, Troy and SureFire make direct connect muzzle devices for the M14. This is due to it's unusual thread size, .595X32.I like that gas lock front sight, very cool and allows for more options for a muzzle brake or flash hider.
All I did was install everything and measure the gap between the barrel shoulder and cylinder with a caliper as I tightened the gas lock. Once I hit about 4:30/5:00 on the last rotation I checked the measurement (was .062" on mine), then got the OD measurement (.8" on mine) and sent a MO with a note including the measurements. About a week later I had the shim in my hands and it was perfect.He,he,he Patriot armory told me to pm you about this shim he made for you.didnt want to bug you so i never did.thanks for posting that.i hate the shim the chassis comes with.