wow what tool erased the gas tube hole in the middle receiver?
tempted to buy one after reading about lapping and "bedding" the barrel ext. WOA sells oversized barrel exts now. though I don't have the expertise to install one
Read and watched vids on using shim to improve barrel to receiver fit. Did that on my 6.5 Grendel build. If it does anything...
. Makes me feel good about it. Did not so a before and after. but the guy who I watched, being a NM gunsmith for ARs and such, had a sound argument in my eyes.
Don't know how well the tools described above does much of anything besides removing the anodizing from the front of the receiver face. The fact that is must spin inside the bore of the receiver, and that it must only contact that very front portion of the receiver loose enough to spin doesn't seem like it would be perfectly square to the bore of the action. Also, what about the barrel extension? how do you know that's perfect?
I figure, the barrel fit (tightness) is more important than the face of the receiver, unless it is way way off.