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  2. 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 ...

  3. 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 ...

  4. 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.

  5. Colt AR-15 - Wikipedia

    en.wikipedia.org/wiki/Colt_AR-15

    The Colt AR-15 is a product line of magazine-fed, gas-operated, autoloading rifle manufactured by Colt's Manufacturing Company ("Colt") in many configurations. [1] The rifle is a derivative of its predecessor, the lightweight ArmaLite AR-15 , an automatic rifle designed by Eugene Stoner and other engineers at ArmaLite in 1956.

  6. 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 ...

  7. Adcor A-556 - Wikipedia

    en.wikipedia.org/wiki/Adcor_A-556

    On December 8, 2010, Adcor announced production of the A-556 rifle to the civilian market. On June 27, 2011, it was announced that the improved A-556 Elite variant would be available for sale to the public. In June 2012, a soldier was seen in Afghanistan with a A-556 upper receiver with a 10.5 inch barrel on an M4 lower receiver. [4]

  8. 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]

  9. AR-57 - Wikipedia

    en.wikipedia.org/wiki/AR-57

    The AR-57 PDW upper is a new design on AR-15/M16 rifles, blending the AR-15/M16 lower with a lightweight, monolithic upper receiver system chambered in 5.7×28mm. This model is also sold as a complete rifle, supplied with two 50-round P90 magazines. [1]