Having problem with handguard rail matching upper rail. I have LR-308 AR Stoner Billet Gen Low Profile. Had to return 2 handguards,
Would you have any suggestion on where and what I need to order
HOWEVER - if the upper receiver is like a lot of billet receivers in general, you'd likely need to look for one without anti-rotation tabs. The tabs themselves will prevent the handguard from seating all the way flush with the receiver UNLESS you file off some material on the anti-rotation tabs.
Don't buy any that says DPMS High or for 0.210 tang.