barrel / hopup upgraded
 

k, so i have a King Arms Colt metal M4 AEG. I replaced the 368mm inner barrel with a 363 Madbull stainless steel 6.03 inner barrel and i installed a Madbull metal hop up ( with the single adjustment gear). Now, as I fire, I seem to get a side spin going and I can't maintain a tight group (and yes I know proper firing techniques). Can anyone make a suggestion to what I could correct in the weapon to improve my grouping ??

If the BBs are hooking or slicing that means the nub/arm aren't at dead 12:00.

And for the rest you'll also need to post the weight of BBs and the range that your target is at.

thanks, I thought it might have been the nub placement. I was firing BB Bastard 0.25g at approximately 80 ft.

In addition to what Danke said, the barrel may be sitting crooked in the hopup, or the rubber sleeve may be sitting crooked on the barrel.

thanks Wrath144, I will double check everything in the hop up unit. The bucking did feel like it may not have been placed perfectly.

Also check whenever the barrel is straight or not, you would be surprised with the amount of stock guns that come with crooked inner barrels