upgrading a G&G M4 CQB-R advanced
I need some suggestions on how to upgrade my G&G M4 CQB-R advanced. It fires around 370 FPS, I would like to get it around 450, but no higher than that.
Here are the features the advanced version already has:
8mm Ball Bearing Bushings
G&G "Strong" Motor
Metal Ball Bearing Spring Guide
Reinforced Piston
Metal Piston Head
Silver Wiring
Silver Electroplated Tight Bore Barrel
Could really use the help. Kind of new to airsoft. Thanks.
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