Patriot OrdnanceUpprRcvrAssm223 16.5″DpFltdBbl11″RailBlk


Gen 4 Upper Receiver Assembly .223

Out of stock


Upper Receiver Assembly 223 Gen 4, Black, 11″ M.R.R.


– 16.5″
– Weight: 5.3 lbs
– Overall Length: 23.75″
– Match grade barrels fluted to reduce weight and dissipate heat.
– 4150 Mil-B-11595E chromoly alloy.
– Corrosion resistant nitride heat-treated 1:8.
– POF-USA triple-port muzzle devices.
– POF-USA oversized heat-sink barrel nut.
– 5.56×45 mm NATO (.223 Remington) chamber.
– E dual-extraction chamber technology (GEN 4 ONLY).

Method of Operation:

– Semi-auto (P415) or full-auto select-fire (P416) rotating bolt, short-stroke gas piston system.
– Corrosion resistant nitride heat-treated gas piston system consisting of a single piece gas block, gas plug, gas piston, and operating rod.
– Multi-position regulating gas system with normal, suppressed, and bolt-action (off) operating modes.

Bolt & Carrier:

– Nickel plated bolt carrier with integrated bolt carrier key.
– POF-USA roller cam pin with chrome plated stem and NP3 roller.
– Chrome plated bolt.

Upper Receiver:

– POF-USA patented Modular Railed Receiver (M.R.R.) free-floating monolithic rail system.
– Billet machined 7075-T6 aircraft aluminum alloy.
– 2-piece upper receiver.
– Black anodized billet charging handle.


– POF-USA free-floating modular, aluminum handguard.
– Integrated picatinny rail-estate for 10″ and 7.25″ barrels.
– Black Anodized


– All raw materials, heat-treats, platings/coatings, accessories, and component parts on our weapon systems are made 100% through U.S. owned and operated steel mills and manufacturers.
Upper Receiver Assembly 223 Gen 4, Black, 11″ M.R.R.

Additional information

Weight1.3 lbs


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