Note: If you found difficult to install this kits, it may cuased by variation of AEG dimension.
You can download information here to solve the problem. Click here
About real PWS Diablo:
The Diablo Upper is Primary Weapons Systemsﾒ answer to the 7ﾔ 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ﾔ barrels.
We started with the barrel and after careful research decided on a 7ﾔ (not 7.5ﾔ) 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.
The MadBull Airsoft version kits: (Note: Thsi is Airsoft version which is made of lower grade materials and different dimension, Do not apply to real firearms.)
Including Handguard set, Outter barrel, Barrel nut, Compensator, and Non-functional piston decoration.
Not including upper receiver. You can purchase similiar upper receiver:
Videos for real Diablo shooting: