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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.
Government-specified barrel profile increased to between 0.675 and 0.575 inches; A2: Also referred to as the "government" or "gov't" profile. Barrel profile for which the portion of the barrel in front of handguards is thickened to 0.715 inches; HBAR: A barrel that in some portion is thicker than government-profile, usually underneath the ...
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.
The AR-15's "duckbill" flash suppressor had three tines or prongs and was designed to preserve the shooter's night vision by disrupting the flash. Early AR-15's had a 25-round magazine. Later model AR-15s used a 20-round waffle-patterned magazine that was meant to be a lightweight, disposable item.
Rear side of a CZ-75B pistol barrel showing the (here dirty) feed ramp. Locking lug feed ramp on AR-15 barrel nut. A feed ramp is a basic feature of many breech loading cartridge firearm designs. It is a tightly machined and polished piece of metal which guides a cartridge from the top of the magazine into the firing chamber of the barrel.
The rifle has an AR-15-based pistol grip, safety selector, trigger group and a buffer tube. [2] It was influenced by the CMMG Mk3 assault rifles. [9] The Mk47 relies on a direct impingement gas system. [10] For rifles/pistols being marketed to California, they are sold with Vepr 10-round magazines and with the mandated bullet button on the ...
The first version produced for commercial sale by Colt was the SP1 model AR-15 Sporter in .223 Remington, with a 20-inch (51 cm) barrel and issued with five-round magazines. [21] Initial sales of the Colt AR-15 were slow, primarily due to its fixed sights and carry handle that made scopes difficult to mount and awkward to use. [84]
At this point, the bureaucratic battle lines were well-defined, with the Army ordnance agencies opposed to the AR-15 and the Air Force and civilian leadership of the Defense Department in favor. [27] In January 1963, Secretary of Defense Robert McNamara concluded that the AR-15 was the superior weapon system and ordered a halt to M14 production ...