I want to put a scope on a Bushmaster Flat Top. All of the rings I've tried have been too short without using a riser. I don't see any advantage to bolting on a riser to then bolt rings to. I looked through the Brownell's catalog, and they show 3 one piece ring/base sets. One is by B Square at $81.95, the second is by American Spirit Arms at $89.95, and the third is by M&A at $56.88.

Anyone have any experience and opinion on these mounts?

Thanks.

I didn't like the B Sqaure. I've used the Armalite and Pro mag models. The promag is alittle higher.