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You have to file the slide rails down or you're going to cause damage and use waaaaaay more gas than you should.
Fitment should be done with NO internals installed
The slide has to be able to slide freely on the frame. Then install the blowback chamber and test the smoothness again. Then install the hammer assembly and test again. You're going to be taking parts in and out of the gun a lot as you get parts to fit. This is the most annoying part of GBB upgrades.
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