[Solomance]

Im an avid p90 user. Iv got 3 hicaps and a whack of lows. I prefer the lows by far but not due to problems with the winding. I give out high caps for lender guns. Trick is to lube up the mechanism (really light silicone oil, same as for your gbb).

You can also use the lego mod. I think there is a thread on this elsewhere. It basically you take one of the one peg slanted one and place it in the gap near the big gear on the other side of where the rounds feed into the mechanism. And fix in place with glue. It keeps rounds feeding consistently.

Finally the best way to keep them feeding is when you slap a new mag in point the gun slightly up so that rounds feed into the mechanism clean so it wont unwind all at once. That way you can get through a whole 300round mag in one wind ( or one trigger pull ).

Just remember to use the loading flap, the mechanism will break if someone uses a loading tube or loader.