The Diablo Upper is Primary Weapons Systems’ answer to the 7” AR-15/M-16 series upper. Rather than simply bolting on an existing product and calling it revolutionary, PWS stepped back and designed a system from the ground up to work specifically with the extreme pressures of the 7” barrels.
The Diablo upper utilizes a long stroke piston system for additional dwell time and smooth recoil. The system is rounded out with the new CQB comp from PWS - a comp designed for short barrels that compensates, suppresses flash and directs all the blast forward.
Must use Vltor upper receiver.
Won't work with standard flattop receiver.
Have to mod Magpul XTM covers to fit.
Would not recommend to novice builders.
Rating: [4 of 5 Stars!]