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4.6×30mm – PDW; 5.45×39mm [2] – intermediate; 5.56×45mm NATO – Original M16A1 cartridge: Can also safely fire .223 Remington, intermediate [2]; FN 5.7×28mm – PDW; 6mm Mongoose (wildcat)
Thales Australia [7] 5.56×45mm NATO/.300 Blackout Australia: 2023 Adcor A-556: Adcor Defense 5.56×45mm NATO United States: yes 2010-2020 ACR: Remington Arms Bushmaster: 5.56×45mm NATO 6.8mm Remington SPC United States: yes 2006 ADS: KBP Instrument Design Bureau: 5.45×39mm 5.45×39mm PSP Russia: 2007 AICW: Defence Science and Technology ...
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]
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.
The standard XM-15 has a forged 7075T6 aircraft-grade aluminum upper and lower receiver. Barrels of XM-15 firearms have a heavy profile and are hard chrome-lined 4150 alloy steel or 416 stainless steel. [2] [4] In Bushmaster's 2016 sales brochure, all new-production XM-15s are stated to be supplied with a 4150 steel barrel. [5]
The Honey Badger was developed with a standard M4 upper and lower receiver, a short barrel with a very short gas impingement system and fast rate of rifling twist, a large conventional detachable silencer, and a proprietary buffer tube and collapsible stock featuring two prongs. [10]
The .30 Remington AR / 7x39mm Remington AR is an intermediate cartridge created in 2008 by Remington Arms to fill a perceived gap in performance on large game between the .223 Remington and larger cartridges such as the .308 Winchester. [1]
When using the AR-15 family of rifles, all three of these alternative calibers use the same bolt carrier group (BCG) and upper receiver as the standard 5.56 x 45 rifle. The 300 BLK requires the forward-most alignment ribs inside the NATO STANAG magazines to be removed, due to the larger diameter of the bullet.