We think the standard A3 upper receiver is pretty good, and hard to improve on (cosmetics don't count), but there are couple of areas we always wished the manufacturer would change. It was one of these "why can't they make it like this, it'd be easier/better" that led to the URF.
URF is based on CMT's URPR-1 7075 billet upper receiver. Type 3 hard coated in black, it is an excellent basis for the two ergonomics driven changes we've always wanted:
1. Relief cuts on the section before rails start for better accessibility of a flip up BUIS's sight stalk / flip up element.
2. Relief on the top of forward assist housing. The relief cut is specifically designed for ambi charging handle users.
When the user uses his right fingers to pinch and grasp the CH's right
latch, the relief allows the index finger to reach down further, so the CH's right latch is positioned in the middle of his finger pad, not the tip of it, for a more
secure purchase, especially if the user has gloves on. When we use our
left fingers to grab the charging handle's left latch, there is nothing
below the latch, but on an upper with forward assist, its housing stands
in the way. The relief simply provides what room that can be spared on
the FA housing so more of the user's finger can have a positive
The FA housing relief is a simple broad stroke. In retrospect, we could have made its presence less shockingly obvious. The change we made is there to work, we didn't give much thoughts to how it'd look, only that it'd create as much clearance as the FA housing can afford to give. Our design philosophy emphasizes utility, innovation and quality derived advantages, aesthetics is a super minority in this equation.NOTE:
Should LDFA and/or ejection port cover assembly be ordered with URF, neither will be installed, but shipped with the URF as individual components.
5 axis machined from 7075 T6 billet
M4 feed ramps
Engraved “T” numbers
1913 picatinny Rail flat top
Mil Spec Type III class II hard coat anodized Black
Forward Assist machined into receiver
Dust cover port machined into receiver
Increased wall thickness for added rigidity
Compatible with Mil spec parts
Compatible with most aftermarket handguard/rail systems
Lifetime warranty against manufacture defects
Comes stripped without dust cover & forward assist assembly
Compatible with "Tactical Link" Enhanced Battery Assist Lever
- Weight: 8.9oz
LMT MARS receivers are incompatible with URF, its right side bolt catch would need to be slightly modified to clear URF's shell deflector.