Once again, no click, it uses allen to zero, lock tight to specks for the size of screw. - Barska GLX 5mW Green Laser Sight w/ Built-in Picatinny Rail

I love this Small but Very accurate Laser. The number one Thing to do is find out What size the Mounting Screws are to the Rail. Use Lock Tight AND TORQUE THEM DOWN CORRECTLY. THATS THE MAIN issue People seem to not understand. JUST LIKE LEGECY HAS SAID USE LOCK TIGHT. ABD USE THE FAT BOY TORQUE WRENCH TO TIGHTEN IT TO THE RAIL WITHIN TORQUE SPEC’S. The very small ( 2 ) of them you dial in the Laser to Match the Laser Arbor that I use for that caliber in the Chamber. Then it’s dead on Very first Shot.

I’ve never had an issue with loosing my Zero on the Laser Become Loose. YOU cannot USE LOCK TIGHT ON THE ALLEN ADJUSTMENT SCREWS. THEY WILL STAY PUT.