Feeding issues are caused by:
-Crappy mags
-Crappy Hop Up unit and rubber
-Damaged or crappy airnozzle
-damaged or crappy tappet plate
lets start from the most likely and work our way. The mags, what magazine are you using and what magazine is your friend using? Is the gun completely stock? If it is, then the hop up unit isnt helping you out any, neither is the airnozzle or the tappet plate. The first one I'd replace is the tappet plate as this is usually the issue. The airnozzle might be causing some problems but I'd highly doubt it.