*facepalm* its called a Hop up nub. The bucking is the sleeve.
And the way you get it in is by removing the inner barrel and bucking from the chamber. Then using a small flathead, you slide it into the "hole" inside the hopup chamber. Once its seated properly, Replace the bucking onto the inner barrel and slide the whole assembly in.
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Last edited by DarkAngel; January 10th, 2010 at 20:41..
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