Additional gearbox features include a modular spring guide system that will allow the spring to be changed without completely disassembling the gearbox

Magazine capacity: 140 rounds

Manufactured of highly durable 1000D Nylon

Works with Umarex/H&K 417 Series Airsoft AEG Magazines

The nylon fiber body holds a 300 rd drop-free hi-cap magazine for full and semi-auto action

SHS Aluminum Cylinder Head for Airsoft Version 2 Gearboxes AEG Sling Mount Additional gearbox features include aDetails: This is a 7075 CNC Machined Cylinder Head by SHS. Because the Piston assembly is constantly slamming against the Cylinder Head during a gearbox cycle, the Cylinder Head endures a lot of stress. Plastic Cylinder Heads tend to crack and fail over time as a result of these stressors. Unlike stock plastic Cylinder Heads, this unit is built from high grade aluminum and can withstand the strongest of springs. Due to the dual O ring design, this