Manufacturer: G&G Model: M4A1 BB Type: 6mm .20g Velocity: 350 FPS Range: 120ft Magazine Capacity: 120rd This built was specifically external, nothing done internally (yet). It took awhile and a lot of tinkering to get it all to fit together like I wanted, but I think it looks good. I'm especially proud of the integrated suppressor on the MOE handguard. Parts: D-Boys Folding Stock CB Battery Pouch KSC Folding Sights AIM Red Dot Sight G&G 120rd Short Mag Magpul Black 5.56mm SRC Delta Ring Magpul MOE Handguard Magpul MOE Rails Magpul AFG Foregrip JBU 8.5" Suppressor JG 5.5" Stubby Outer Barrel It took a lot of work to get the stock to fit on, had to saw off the tube on the lower receiver and use a new bolt instead of the old stock screw, with nuts as spacers. Removed old one piece RIS and installed delta ring and MOE handguard, 5.5" barrel, and suppressor. Tried to integrate the suppressor into the handguard and had to use hose clamps to hold the handguard in place for lack of a front sight post or gas block to do that job. Works great. Also had to saw down the inner barrel as it protruded out of the suppressor about an inch.