Does anyone know for sure (not probably or should work) if you can use a Gen 3 9mm barrel in a Gen 4 pistol . I believe the only difference in the barrels is the cut out for the different RSA's rear diameter. I heard the answer from Glock is no. I don't believe the Gen 4 RSA would sit level when in place and might lower the pistols reliability. The only factory threaded barrels for the G17 and G19 that I know of are Gen 3 barrels.
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