Must be a king arms thing...
I have the King Arms M4A1 AEG, and I've fired... Probably a total of 400 bb's and I get the same problem...
After researching it extensively (2am due to my absolute frustration) I found a bunch of videos showing that the O ring inside the piston cylinder is really loose...
Not sure if this is the norm for airsoft rifles, I literally purchased this rifle a week ago, and she's my first.
Also, from what I've learned it's probably the bucking or air nozzle. Both are cheap fixes, but I figure you're the same as me and don't want to be constantly changing out parts.
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