I was pleased with the quality of the MTU005, but the screw holes on the provided barrel nut were blocked by the upper receiver of my DPMS A-15. This prevented the screws that secure the quad rail to the barrel nut from entering the the holes in the barrel nut. I wasn't able to install the Quad Rail. I was disappointed to say the least. Don't know if this is a problem with other AR-15's.
Pros: Appears to be an excellent quality, free float quad rail.
Cons: Would not fit my DPMS A-15
This review was written in the old system and had content requirements that are different than reviews written today.