Here's a little tip when experiencing some misfeeds because of the china made hi-cap magazine. Fixing the manufacturing or assembly flaw of the magazine.

Here's the so called spring coil housing. It's the part responsible for feeding the bb's up the gun until chambered as long the mag is winded manually or motorized. Standard spring-coil housing on all hi-cap mag types like ak47, m4, g36, sig552, m14, etc. so this tip is applicable to all hicap mags even motorized mags.

Now here's the culprit causing the misfeeds. The cover of the spring housing is slightly open due to pressure when fully winding the mag. This however is adding resistance making the housing operate in a flawed manner one of the reason of so many other things why we get some misfeeds especially when not fully winded up.  

 So simply remove the cover and put some mighty bond on those little knobsas shown on the pics...

See the liquidy bonding agent (adhesive)...  

 
once thouroughly applied to all knobs simply press fit the cover back so the spring-coil housing is now very flat looking at it on the side. This will ensure a smoother operation and less worries of the cover opening up again.