Great - Leupold Base Mark 4 CQ/T Throw Lever Mount Matte Black 57506

very tight fit. thankfully i have not needed to utilize its purpose in a stress full situation, but it works well. never lost zero when re-attatched. i use it on a bushmaster ACR and my only prob is depending on where you like your optic, it can skin a knuckle when charging the bolt
Pros: low pro, tight fit, quality build
Cons: size, expense

This review was written in the old system and had content requirements that are different than reviews written today.