usp full size rails???

[morepoop4u]

are they all the same size for usp 9,40,45? I just got the surefire p115d weapon light off of ar15.com's EE for a smoking deal but the manual says usp 40/45. I don't have the usp 9 yet, but hopefully by x mas I will haha.

[ligamentum flavum]

should fit as long as it's a full-size USP.