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Any AR-15/AR-10 cartridge cases that are derived from the 7.62x51 can also be formed from these listed calibers. (7.62x51 & .308 are similar in external dimensions though the Brass has different internal capacity and Max PSI recommendations are different & Chambers are different.) AR-10: The AR-10 is slightly larger and heavier than the AR-15.
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]
In January 2017, at the 2017 Shot Show in Las Vegas, NV, Stag Arm's announced its first AR-10 type rifle, marketed as Stag-10. [7] This rifle features the .308 caliber cartridge and will be available in the left-handed variant by July 2017. Along with this .308 left-handed platform, Stag Arm's will also be releasing a 6.5 Creedmoor in July 2017.
The AR-15 is nominally chambered in .223 Remington or 5.56×45mm NATO, with the .223 Wylde chamber allowing for the safe chambering of both, but many variants have been produced in different calibers such as .22 LR (sometimes referred to as an AR-22 [59]), 7.62×39mm, 9×19mm Parabellum, [60] 6.5mm Grendel, and shotgun calibers. [61]
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 AR-15 uses an L-type flip, aperture rear sight and it is adjustable with two settings, 0 to 300 meters and 300 to 400 meters. [16] The front sight is a post adjustable for elevation. The rear sight can be adjusted for windage. The sights can be adjusted with a bullet tip or pointed tool. The AR-15 can also mount a scope on the carrying handle.
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In hunting applications, the 7.62×40mm WT delivers slightly more energy than the 7.62×39mm and is similar to the 6.8 SPC [7] and .30-30 Winchester, making it useful for game such as deer and feral hogs, particularly for hunters who want to use an AR-15, but cannot legally use the 5.56 round, due to its low power factor on game.