Tuesday, May 6, 2014

Fortis Rail Installation

As mentioned on my modification of my PSA 14.7" upper, I did have some issues with the installation of my Fortis REV rail. That said, all was resolved with the assistance of a rail mount, specifically my Burris PEPR QD scope mount.

The rail comes in three parts and attaches to the barrel nut; the main body of the rail [1], the lower locking component [2], and four anti-rotational screws [3].

[1] Attached a Rail Mount

This is the key for correct alignment, you'll want to use a rail mount that extends between the Fortis rail and your upper receiver, whether it be an optic mount (like mine) or a carry handle. I used my Burris PEPR QD scope mount.

Simply place the main body of the rail [1] into position. Be careful not to mar your barrel and the barrel nut when installing the rail. Once in place, attached your rail mount. Once the rail mount is locked into position, insert the lower locking component [2], add a small amount of Blue Loctite (if you want to, I didn't), and screw in the anti-rotational screws [3] by hand.

[2] Torque Wrench

If you have it, use it! I have a FAT Wrench that I use for the installation of my scopes, highly recommended whenever installing optics. Over-torquing or under-torque can affect accuracy and consistency. I contacted Fortis and this is what they had to say:

Approximately 60-75 inch pounds.

Fortis Manufacturing, Inc. - "Strength by Design™"
P.253.230.7285 / www.fortismfg.com

I set my FAT Wrench at 60 IN LB and then cross torqued the screws into place.

Once set, I removed the PEPR scope mount.

[3] Finished View

Mind the gap! A common point by many is that there is a gap on the Fortis rail. You'll also notice a slight step on mine, too. Not ideal, but I recently installed Magpul MBUS Pros and I did not have to make any drastic adjustments for elevation. If there had been a problem, I would have exchanged the rail.

Close up view of what to expect when the bottom locking component is mated with the main body of the rail.

A slight gap on the rail tab.

And the money shot.

Final notes. I had initially attempted to install the Fortis REV on a LAR Grizzly billet upper, but they were incompatible. One solution is to cut off the rail tabs, however, I obviously decided against this and stuck with the YHM rail on my LAR upper. The VLTOR MUR uppers do successfully mate with the Fortis REV Rails without removing the tabs, but will have that slight gap between the rail and the upper.

Lastly, I love shooting this rifle as it is very lightweight and ergonomic. Hell, I need to go shoot tomorrow or tonite, been locked up doing freelance work and need some range time.