Can't tell if there's already a channel liner installed. Is there a non-visual way to be sure? Should I just get a channel liner removal tool to test? : r/Glocks
Jentra Channel Liner Install & Removal Tool for Glock Gen 1-5 | NDZ Performance
Channel Liner Install Tool for All Gl0ck Models Anodized Black - Amazon.com
TruGlo Channel Liner Combo Tool Glock - Other Gun Accessories & Parts at GunBroker.com : 1000982447
LWD Channel Liner Installation Tool - Lone Wolf Arms
Tactics Glock Channel Liner Installation and Removal Tool Plus Liner - AliExpress
Channel Liner Install and Removal tool - Glockparts.com