Last edited by JR1572; 02-08-2016 at 11:28 PM.
The 63xx series holsters work with and without a light for a given barrel length, such as G17 with or without a light, but not if you put a G19 in a G17 holster. They use a barrel plug at the muzzle end to index the pistol relative to the ALS ejection port locking mechanism.
Anything I post is my opinion alone as a private citizen.