I can't remember which key I used, however, I did do quite a bit of filing on the key to get it to work and get the TLR-4 as far back as possible. Actually there's only room enough to get a piece of paper between the rear of the TLR-4 and the front of the trigger guard. I personally like it this way, and have never experienced any drag on the on/off switch.....clears, but just barely.What key do you use on your TLR-4 for your PPQ? Yours looks like it is slightly to the rear of where mine is.
I love my TLR-3 (Now on my Caracal-F) and my TLR-4 on my PPQ for my nightstand gun.
I just bought a CRM-201 and installed it on my PPQ. As soon as I take it for a test drive I'll do a little write up. I was going to shoot it today. However, the range was nuts. Everyone is shooting their Christmas presents.Has anyone tried the Crimson Trace CMR 201 on the PPQ?