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The AR-15 rifle usually comes chambered for either the military cartridge 5.56×45mm or the .223 Remington. Because of the pressures associated with the 5.56×45mm, it is not advisable to fire 5.56×45mm rounds in an AR-15 marked as .223 Remington, since this can result in damage to the rifle or injury to the shooter. [1]
The sporting rifle has both chamber options of 5.56×45mm NATO for the carbine specification and .223 Wylde for the SBR specification. [ 7 ] The LVOA-C weighs 7 pounds (3.2 kg) unloaded (7.5 pounds (3.4 kg) with a 30-round magazine) and measures 35.5 inches (90 cm) in length (32.75 inches (83.2 cm) with a closed stock).
Bill Wylde of Greenup, Illinois, compared the two cartridges and changed the chamber of the rifle's barrel to a specification he called the .223 Wylde chamber. The chamber is made with the external dimensions and leade angle found in the military 5.56×45mm NATO cartridge and the 0.2240 in (5.69 mm) freebore diameter found in the civilian SAAMI .
Magpul has been granted a patent [47] for a STANAG-compatible casket magazine, [48] and such a magazine was also debuted by SureFire in December 2010, and is now sold as the MAG5-60 and MAG5-100 high capacity magazine (HCM) in 60 and 100 round capacities, respectively, in 5.56mm for AR-15 compatible with M4/M16/AR-15 variants and other firearms ...
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.
Two 30 round AR-15 magazines coupled together, for example, is often a cheaper and more reliable alterative to a 60-round drum magazine, especially for applications such as home defense. However, jungle style magazines can often be impractical as it exposes the rounds and feed lips to foreign objects like mud and dirt which can cause malfunctions.
The AR-7 was designed by American firearms designer Eugene Stoner, who is most associated with the development of the ArmaLite AR-15 rifle that was adopted by the US military as the M16. The civilian AR-7's intended markets today are backpackers and other recreational users as a takedown utility rifle. The AR-7 is intended for users of ...