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Since I get back from a collector to a weekend warrior, using the vfc mp5, game and fine tune couple of time , now is working like a champ even having a extreme smooth in full auto. The tricky parts is between vfc nozzle and original hop up set, with the bolt guide is a must too. Make sure the head of the nozzle is just right fit into the hop up set but not too tight. With the azi loading ramp, keep the mag in place and minimize wobbling and maximize gas consumption in no leakage. I also us metal piece and screw to reinforce the empty bolt lock function. That's last longer though.
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aka Uncle
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