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  2. Colt Canada C7 and C8 - Wikipedia

    en.wikipedia.org/wiki/Colt_Canada_C7_and_C8

    In 2008 or 2009, Colt Canada introduced a completely new designed upper receiver with integrated rail attachment system. [15] The front handguard is in this system permanently attached to the upper receiver. The whole system is forged from one piece, and is sometimes called a monolithic rail. This system allows for a completely free floating ...

  3. Colt IAR6940 - Wikipedia

    en.wikipedia.org/wiki/Colt_IAR6940

    The IAR6940 is marginally heavier than the IAR6940H at 10.1 lb (4.6 kg) compared to the latter at 9.28 lb (4.21 kg), with the main reason being that the IAR6940 sported a monolithic upper receiver while the IAR6940H used a lighter Knight's Armament Handguard. [5] Colt submitted the two variants as contenders for to the IAR program.

  4. Colt CM901 - Wikipedia

    en.wikipedia.org/wiki/Colt_CM901

    The lower receiver will also accept older mil-spec M16 or M16 upper receivers with an adapter. Receivers will be available that accept 5.56×45mm NATO rounds, 6.8×43mm Remington SPC rounds, 7.62×39mm rounds, and 7.62×51mm NATO rounds. Each upper receiver has its own rail system, which allows scopes, or other optics to be pre-sighted for each ...

  5. Mk 12 Special Purpose Rifle - Wikipedia

    en.wikipedia.org/wiki/Mk_12_Special_Purpose_Rifle

    [2] [3] SPR initially stood for Special Purpose Receiver as it referred to an add-on upper receiver assembly (part of the proposed SOPMOD upgrades), [4] [5] but that nomenclature changed to Special Purpose Rifle as the weapon became a stand-alone weapons system. [6] The SPR was eventually type-classified by the U.S. Navy as the Mk 12. [6]

  6. Advanced Colt Carbine-Monolithic - Wikipedia

    en.wikipedia.org/wiki/Advanced_Colt_Carbine...

    The Colt ACC-M (Advanced Colt Carbine-Monolithic) adds Colt's proprietary, monolithic Mil-Std-1913 rail system (quad rail) forward hand guard to the normal M4 carbine upper receiver. Colt M4 Carbines and Colt M4A1 Carbines can be easily and relatively inexpensively modified/upgraded into ACC-Ms by replacing the upper receiver, which is more ...

  7. Receiver (firearms) - Wikipedia

    en.wikipedia.org/wiki/Receiver_(firearms)

    A disassembled Mauser action showing a partially disassembled receiver and bolt. In firearms terminology and at law, the firearm frame or receiver is the part of a firearm which integrates other components by providing housing for internal action components such as the hammer, bolt or breechblock, firing pin and extractor, and has threaded interfaces for externally attaching ("receiving ...

  8. Colt Advanced Piston Carbine - Wikipedia

    en.wikipedia.org/wiki/Colt_Advanced_Piston_Carbine

    The Colt Advanced Piston Carbine or Colt APC (internal product number P0923) is a lightweight modular 5.56mm caliber piston-operated, magazine fed carbine with a one-piece upper receiver which is capable of firing in automatic and semi-automatic modes.

  9. List of Colt AR-15 and M16 rifle variants - Wikipedia

    en.wikipedia.org/wiki/List_of_Colt_AR-15_and_M16...

    ArmaLite AR-15 with the charging handle located on top of the upper receiver, protected within the carrying handle and a 25-round magazine. 1973 Colt AR-15 SP1 rifle with "slab side" lower receiver (lacking raised boss around magazine release button) and original Colt 20-round magazine.