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I bought a Glock 17L which has a six inch barrel and slide, can the top slide and barrel be changed to five inch"s. I am shooting this gun in USPSA and will test the gun with the 6" barrel. I understand that the 6" has more velocity for the bullet, less felt recoil and better aiming picture than the 5" but I cannot use any compensators on the barrel because of its length, so I am getting the barrel ported. If this does't work out, can I drop the slide and barrel down to 5"?