RHF (Railed Handguard, Forward Controls) is based on the superb CMT
UHPR Mod2, with full length 1913 rails at 12 o'clock, and MLOK at 3, 6,
and 9 o'clock.
Since its introduction in 2018,
RHF has progressively become more robust and durable with the deletion
on lightening cuts and slots. It's gained some weight in the latest
2020 version, but we value strength durability far more than light
weight. It directly contradicts the light weight fad which, like all
fads, are rarely about improving anything for the end user.
is machined from 6000 series extruded aluminum, its barrel nut is
machined from 7075 aluminum, both are Type 3 anodized, while the rail
mounting hardware is machined from 17-4 PH (patent pending). RHF also
incorporates anti-rotation tabs.
diameter is 1.315" and compatible with most low profile gas blocks.
Barrel nut diameter is 1.378", barrel nut wrench is included.
RHF incorporates design input from Forward Controls, the changes include:
1. Omission of QD swivel attachment points. Location of the front sling attachment is left to individual users.
Barrel cooling vents changed to the classic round shape. One might say
we're paying homage to Knight's Armament's RAS and RIS where meaningful
modular revolution began.
3. Simplification of the already understated aesthetics of the CMT UHPR Mod 2 handguard.
Available in 15", 13.7", 12.8", 11.5", 9.5", and 6.7".
Weight of each length as follows (total weight, including mounting bracket and bolts):
15", 12.6 oz
Barrel nut torque: milspec 40-50ft/lbs
Rail clamp screws torque: 45 in/lbs.
A single use (we've successfully used it half a dozen times without ill effects) barrel nut wrench is included.
Made in USA.
SIG M400 upper requires slight modification to fit RHF.
is incompatible with BCM's Mk2 upper receivers without modification to
the RHF's anti-rotation tabs, or to the upper receiver itself.
The scoffed up area is where RHF's anti-rotation tabs need to flank.
requires the vertical portion of the upper, below the 1913 rails, to be
TDP width (0.617 +0.000 / 0.010) . The anti-rotation tabs of RHF
inside diameter is 0.6325. Some upper receivers have a wider section
below the 0.617 width, at 0.6575, RHF will need the anti-rotation tabs
relieved before they can go over the wider section of the upper
receiver. Alternatively, the upper receiver's wider area can be
relieved for the RHF's anti-rotation tabs to go over.
CMT, which produces RHF for us, states:
machined step under the pic rail where it blends with the forged
surface of the upper does vary on some forged uppers and can cause a
slight interference that can be usually be overcome by lightly
pressing/tapping the rail towards the upper itself when installing.