1791 LiteRaider Receivers: 4.8 oz AR-15 Upper, 6.2 oz Lower

1791 Industries, best known for its leather holsters and gear, is now shipping the LiteRaider LRM4 AR-15 receivers: a stripped upper and lower, both made from a metal matrix composite the company positions as a genuine step below aluminum on the scale. The stripped upper weighs 4.8 ounces and the stripped lower weighs 6.2 ounces, numbers that put both parts at the leading edge of the ultralight AR-15 category. Both are shipping now.

The pitch is simple: cut ounces from the parts every AR build starts with, without dropping to polymer. A stripped forged 7075-T6 upper typically weighs around 6.9 ounces and a forged lower around 8.3 ounces, so the LiteRaider set shaves roughly two ounces off each before a barrel, handguard, or trigger goes in. On a weight-focused build those savings stack with everything else you trim. If you are already chasing grams, our best lightweight AR-15 parts guide ranks the barrels, handguards, and BCGs that pair with a set like this.

The headline number is the upper at 4.8 ounces, which 1791 calls the lightest metal AR-15 upper on the market. It is not a stripped billet shell with features machined away either: the LiteRaider upper retains a forward assist port, dust cover bracket, and shell deflector, so it runs like a standard mil-spec upper and accepts a normal bolt carrier group and charging handle. The 6.2-ounce lower follows the same approach, keeping the standard AR-15 fire control pocket and parts compatibility rather than requiring proprietary internals.

Two ounces per receiver may not sound dramatic in isolation, but receiver weight sits at the center of the rifle where it does the least for balance and the most for total mass. Trimming it is how dedicated lightweight builds get under six pounds. Pair the LiteRaider set with a pencil-profile barrel, a carbon or thin aluminum handguard, and a lightweight bolt carrier group, then plan the rest of the rifle in our rifle builder to see how the numbers add up.

The weight savings come from the material, not from thinning the walls. Metal matrix composite combines pure metals with ceramic nanoparticles, a blend that raises stiffness while lowering density relative to conventional aluminum. 1791 says the resulting receivers are up to 35% lighter than 7075-T6 aluminum yet carry comparable strength and durability, with added vibration dampening and thermal resistance as secondary benefits. Both receivers are anodized and Cerakoted, so the finish is built to hold up rather than relying on the raw composite surface.

New materials in load-bearing firearm parts earn trust through testing, and 1791 states the LiteRaider receivers were destructive tested, drop tested, and environmentally tested before release, and that they are built to mil-spec standards. The important distinction for buyers wary of polymer lowers: this is a metal composite, not a plastic. It is engineered to behave like aluminum in the ways that matter for a receiver while weighing less, and it accepts the same mil-spec parts you would install in any forged receiver.

The receivers anchor a broader LiteRaider line built around the same weight-first goal. 1791 is also shipping lightweight handguards for both AR-15/M4 and AK platforms, LiteRaider charging handles, hand stops, and 1913 rail sections. That lets a builder assemble a matched lightweight upper group from a single source rather than hunting individual parts, and it signals 1791 intends the line to be a full component family rather than a one-off receiver experiment.

The AK handguards are the notable outlier, since ultralight AK furniture is far rarer than AR options. For AR-15 builders, the handguard is where the next big weight decision lives after the receivers and barrel, and it is worth choosing deliberately. Our AR-15 handguard guide ranks the lightest free-float options and explains where a few grams of rail are worth keeping.

The LiteRaider receivers are for the builder whose priority is total rifle weight: backcountry and hunting AR builds, minimalist patrol or truck guns, and anyone assembling a sub-six-pound rifle where every part is chosen by the ounce. At $299.99 for the upper and $329.99 for the lower, the set runs $629.98, a clear premium over a forged aluminum receiver set that can be had for well under $200 combined. The weight savings and the novel material are what you are paying for, so the math only works if lightness is a real requirement for your build rather than a nice-to-have.

One practical buying note: the stripped lower is the serialized firearm, so it ships to an FFL for transfer and a background check like any AR-15 lower, while the upper ships directly to you. If you are speccing a complete build around these receivers, compare options side by side in our build comparison tool and lean on the weight management guide to make sure the receivers are not the only place you are saving grams. A light receiver set under a heavy barrel and optic defeats the point.