Great in theory - BlackHawk M4 Collapsible Buttstock Magazine Pouches

Great idea and handy. Keeps an extra magazine right on your weapon. Where you need it when you need it. Only problem is the strap that attaches it to the buffer tube directly interferes with the operation of the charging handle unless the stock is fully extended.
Pros: Extra magazine everywhere your weapon is
Cons: Interferes with operation of charging handle

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