Ordered one, found to be of superior quality compared to the other extended slide locks I was using before. It did give me slightly smaller groups, but the truth is - I did not have much time to shoot the gun... It fits perfectly under my G17 slide, my G22 slide, my .357sig and LWD .40-9 conversion barrels, as well as on gen4 G23: Mr. Graham, it was real pleasure to do business with you Sir, thank you for your excellent product, good luck and best regards! Wanna kill these ads? We can help!