this makes it possible to change the firing sequence giving it the ability to operate in both true closed bolt as well as "AEG" mode

20 gram BBs to launch at 300 FPS

This version launches

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Descriptions: This type of cylinder head is used for replacing the original plastic one

HK 45CT GBB Color:FDE this makes it possible toGet into some top gear! The Heckler & Koch HK 45CT Gas Blow Back is hot property on or off of the airsoft field. This compact platforem features a threaded outer barrel, 14mm left hand, adjustable hop up, and a 20 round drop free magazine. This compact GBB also comes with a small and large interchangable back straps and three extra fill port O rings. Expect . 20 gram BBs to launch at 300 FPS.