I am considering getting a Leitner Wise upper and was wondering if a LaRue handguard will fit over the gas piston system?
If you send in a CASV-EL......then they can test their theory that it needs a little bit of machining.....
Otherwise Ridge is bang on.
The Larue is too narrow in sidewalls of the top rail to accomodate the piston.
The ARM-R works great and even has a retuirn to zero removable top half that lets you open in up without tools and get right into the piston for that concous d'elegance cleaning that is unnecessary.