I finally put together an upper with a low pro gas block, alpha rail, and space for a light at 12 o'clock. Put a DD fixed front sight and didn't realize a TLR-3 is too tall to work. A TLR-1s is better but still a tall light. X300 works but lives on a Glock.

Looks like Inforce might be an option instead of spending another $200 on a Surefire X300.

Goteron, thanks for the pictures! Going to order the WML.