Obviously the US players get first dibs at this nice looking accessory from MadBull Airsoft... "Produced by PWS Primary Weapon Systems. The Diablo Upper is Primary Weapons Systems’ answer to the 7in 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 7in barrels.

We started with the barrel and after careful research decided on a 7in (not 7.5in) stainless steel polygonal bore barrel with a 1:8 twist.  A match bolt carrier assembly is housed inside of a MUR-1 (mil-spec) upper receiver with a billet machined charging handle.  Low profile quad rails give the most possible room for accessories and XTM rail covers.

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.

About MadBull PWS licensed Diablo:
Includes handguard rails RAS, Decoration gas piston tube, outer barrel, and compensator."