I've read possible issues on both but haven't tried them so i can't tell which to order. In my opinion the mount on the a is way more secure and easier to deal with. U and p refer to the interchangeable (adapter) rail piece. Both a and b model will come with a u (universal) and p (pic rail). From what i hear a has more slop than b but b can.
What is the practical difference of these two, witch one should i buy? I would probably use the light on. The x300 lineup of weapons lights comes from the factory with the bar that fits into the rail slot sized for the narrower glock type rail. The light has a kit to change out this bar to fit.
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