I strongly recommend DNZ one-piece mounts. I put this on a TC .223 15" pistol with a Burris 2-7 Handgun scope. Fit perfectly; took about 5 min to lap perfectly round. Pistol will shoot 100% into 4" target at 100 yds hand held off a sandbag in front. Not kidding!
Pros: Rock solid one-piece mount
Cons: none
This review was written in the old system and had content requirements that are different than reviews written today.