All of the old (and new) factory synthetic stocks flex in the forearm, there's no getting away from that. When I said any factory sporter stock would work, I was talking wood not synthetic - no sense in wasting ones time on a factory synthetic when they're garbage to start with.

That said, I somehow missed the part where you said Heavy Pac-Nor barrel in the first post so a factory sporter stock won't work (I was referring to the factory .50cal barrel contour). As such, you'll definitely want/need a factory heavy barrel stock for that Pac-Nor pig you're toting.