APS went the extra mile with their "Silver Edge" gearbox. They took their Hyrbid blowback gearbox shell and fully polished it internally, effectively reducing friction on the piston and other parts that directly contact the gearbox surface. 8mm stainless ball bearings, an extremely smooth trigger and high-heat contact switch, ball bearing spring guide, and steel gear set come pre-installed allowing for an easy, seamless drop-in installation. Compatibility: For APS, Matrix and other compatible Ver.2 Gearbox Airsoft AEG Rifles (Comes with M4 / M16 style selector plate. Other style selector plates sold separately) Gearbox Type: Ver 2, Full Metal Motor: Long Type (Not included) Manufacturer: APS

[Style]: Version 2 - Rear Wired (Non-Blowback). Small Tamiya plug. Reinforced gearbox shell. Integrated "quick spring release" function for easy spring change. 8mm stainless steel ball bearings. Steel gear set. Polycarbonate piston. Fully polished "Silver Edge" gearbox.

Frame Material: Plastic. Barrel Material Type: Metal. Air Gun Power Type: Electric. Item Dimensions LxWxH: 8.75 x 5.75 x 1.95 inches. Caliber: 8. Color: Version 2 - Rear Wired. Brand: Evike. Date First Available: April 9, 2019. Best Sellers Rank: #296,490 in Sports & Outdoors. Customer Reviews: 4.6 out of 5 stars 4 ratings 4.6 out of 5 stars. : B07QDTXVKC. Size: ?One Size. Part Number: ?GB-SE-2HR-NBB. Manufacturer: ?APS / Hakkotsu. Suggested Users: ?unisex. Color: ?Version 2 - Rear Wired. Brand Name: ?Evike. Item Dimensions LxWxH: ?8.75 x 5.75 x 1.95 inches. Package Weight: ?1.45 Pounds. Item Package Dimensions L x W x H: ?8.75 x 5.75 x 1.95 inches.