Originally Posted by Swatt Five-Six
would love to know if anyone else has had this happen, was thinking of getting one for my M4, but if it makes a jump in fps like that, I would not be able to use my gun on most fields as it would be well over 400fps (already doing about 375). Plus, I was poking around for some reviews and came across a board in the US, the name of the board escapes me right now, but some was saying that they had to mod their bodies with some brands of AEGs to get it to fit, and even going as far as to say that Madbull was making a body that this hop up was ment for, that it wasn't ment for other aeg bodies.
It works in any TM style uppers as far as I know. I didn't have to modify anything to install mine in the G&G.