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I've used the same KSC bb's in MP5 (hopup unit is different from AK) I used to have back in the day, I also used those bb's in my second AK. All AEG's had Guarder hopup sleeve in them. Both AKs have stock TM hopup unit. I believe MP5 had stock TM hopup unit as well.
I tested my AK#2 with KSC .2s and discovered that it doesn't perform that well. First couple of shots went through fine but than, after I started firing more backspin effect decreased and eventually came up to 0, same way as AK#1.
It's probably something with hopup sleeve and bb's. I'm just curious to find out what exactly causes it. I was thinking about size of bb's as well. Maybe that what it is. I'll try to test .2s made by other manufacturers and see what's going to happen.
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