Great unit to mount flashlight or anything that does not require zeroing. If you can find a way to attach the bottom half on the barrel then the unit can be somewhat repeatable. But still, it's a lot better than those cheapo railed receiver covers. Great product for the price.
Pros: good price, relatively sturdy, does look intimidating
Cons: does not hold zero if you have to disassemble the unit i.e. clean gas tube
This review was written in the old system and had content requirements that are different than reviews written today.