Well I just got back from test firing my new G&P M4 I got from the Evike black holiday specials (This M4: http://www.evike.com/product_info.php?products_id=39956). I'm having a hard time adjusting the hop up on it. Basically, when I turn the wheel it will turn very easily until it hits a bump then requires more force to continue to turn it up. Pretty much what was happening is that it will not add enough spin until I get past the rough spot then it applies a little too much spin. If I try to bring it back down it will not apply enough backspin. I'm using .25g Evike BBs if that makes any difference, I may go back down to .2g until I can get this resolved. So, I'm guessing it would be best to just get a new hop up chamber and while I'm at it probably a new bucking. What are your guys opinions on my issue as well as suggestion for better aftermarket prices? Thanks!