LCT Airsoft
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Prometheus' Aero Cylinder Head Ver.3 is a replacement cylinder head for Version 3 gearboxes in AK47, G36 and MP5K series AEGs. It's machined from duralumin, an aluminum alloy developed for aircraft use that resists deforming under the piston's impact at the end of every stroke. The Aero porting arrangement moves air into the nozzle with less turbulence than a plain flat face. It seals the front of the cylinder so air only escapes through the nozzle and carries the bumper that stops the piston. Check the o-rings on fitting and replace them if there's any doubt, and verify the angle of engagement afterwards, since a new head can move where the sector gear catches the piston rack.