...An Exception: Someone makes a Delayed Roller Blowback AR15 upper that does not have conventional locking lugs.
Also 22 Rf and Pistol Caliber Carbine uppers do not have locking lugs as far as I know.
Bob R
That's a good point. If you have any intention of doing work on an upper not using an extention with conventional lugs, some of the options mentioned won't work (Bev Block, Reaction Rod (with or without sail). You could use a clamshell type fixture, but some upper types like certain billets might not fit. I don't have a White Oak, but I should be selling my other fixtures and buying one!
