Hey all.

Anyone know which rail mounting system is a better fit for a Walther PPQ the a or the b t lock? Thanks,Amurr

I prefer the one with the screw.

I use the A model with the "P" marked mounting plate with my PPQ M2. Locks up tight with zero play.

Doesn't make a difference. Both models accommodate true picatinny and so-called universal rails with different rail keys. The X300A is quicker on and off with its spring loaded locking mechanism. The X300B is more permanent with the screw. Neither, however, takes very long to install or remove. Kydex holster compatibly varies between the two, though.