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CA quality is hit and miss, I've seen stock CA guns chrono anywhere from 260 to 330 to having a broken piston out of the box.
CA makes bad tappet plates, pistons and air nozzles, and if you in there fixing one thing you might as well fix them all.
Shims, piston, tappet plate, piston head, cylinder head and nozzle should fix all the problems.
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