Great coupler, except for pmags - MFT AR-15 M16 Magazine Coupler

Please know that this is still a great product and is very durable as long as you do not use them for the polymer pmags. It will fit over a pmag, but because of the waffle pattern on the mag, it cause pin point stress on the plastic and will eventually crack and break.
Pros: great value
Cons: does not last on pmags

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