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  2. Lewis Machine & Tool Company - Wikipedia

    en.wikipedia.org/wiki/Lewis_Machine_&_Tool_Company

    The Monolithic Rail Platform (MRP) [3] was created by the company, a one-piece, Picatinny-topped AR-15-pattern upper receiver made from a forged aluminum block. [4] The MRP upper receiver has a quick-change barrel system. [5] Its top rail position matches M4 and E3-type weapons for optical and sight compatibility. [6]

  3. Close Quarters Battle Receiver - Wikipedia

    en.wikipedia.org/wiki/Close_Quarters_Battle_Receiver

    The Close Quarter Battle Receiver (CQBR) [5] is a replacement upper receiver for the M4A1 carbine developed by the US Navy.. The CQBR features a 10.3 in (262 mm) length barrel (similar to the Colt Commando short-barreled M16 variants of the past) which makes the weapon significantly more compact, thus making it easier to use in, and around, vehicles and in tight, confined spaces.

  4. Roberti–Roos Assault Weapons Control Act of 1989 - Wikipedia

    en.wikipedia.org/wiki/Roberti–Roos_Assault...

    The Colt AR-15 Sporter SP1 Carbine is a semi-automatic rifle that is classified as an assault weapon under California law. Firearms are identified as assault weapons by statute in Penal Code sections §30510 and §30515. The original Roberti–Roos assault weapons list identified assault weapons by make and model in Penal Code §30510.

  5. 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 ...

  6. List of 3D-printed weapons and parts - Wikipedia

    en.wikipedia.org/wiki/List_of_3D-printed_weapons...

    Name Date made public Type Process Designer Caliber AR Lower V5 [36]: 2013, March [36]: Receiver: AR-15 rifle lower receiver [36] FDM [37]: Defense Distributed [36].223 Rem/ 5.56x45: The receiver was able to handle enough stress to fire more than 600 rounds.

  7. M4 carbine - Wikipedia

    en.wikipedia.org/wiki/M4_carbine

    A Special Purpose Receiver built by NWSC Crane Division, mounted on an M16A1 lower receiver The SOPMOD program also introduced the Special Purpose Receiver (SPR), a 16-or-18 in (406-or-457 mm) barreled upper receiver that would be mated to an M4A1 lower receiver to allow the weapon to serve as a designated marksman rifle (DMR).

  8. IWI Tavor - Wikipedia

    en.wikipedia.org/wiki/IWI_Tavor

    In 2013, IWI started a US subsidiary, IWI US, which is manufacturing the semi-automatic TC-21 as the Tavor SAR for U.S. sales. [30] The weapon is manufactured with a combination of Israeli and US parts. IWI US had shipped 50,000 Tavor SARs to US civilian customers by early 2016. [31] IWI US sells the Tavor SAR in variety of variants: [32]

  9. Heckler & Koch HK417 - Wikipedia

    en.wikipedia.org/wiki/Heckler_&_Koch_HK417

    The Heckler & Koch HK417 is a battle rifle designed and manufactured by Heckler & Koch. [1]Being the larger caliber version of the Heckler & Koch HK416, and chambered for the 7.62×51mm NATO rifle cartridge, it is intended for use where the penetrative power, stopping power, and range of the 5.56×45mm NATO HK416 would otherwise be insufficient.