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16 in. A1 1:7 Yes A2 AR6551 AR-15 Target Model A2 Ribbed S-1 A2 Yes Yes .223 REM 5.56 NATO 20 in. A2 1:7 Yes A2 AR6601 AR-15 Match HBAR A2 Ribbed S-1 A2 Yes Yes .223 REM 5.56 NATO 20 in. HBAR 1:7 Yes A2 AR6700 AR-15 Competition HBAR A2 Ribbed S-1 Flattop Yes Yes .223 REM 5.56 NATO 20 in. HBAR 1:9 Yes A2 AR15A4 AR-15A4 Rifle A2 Ribbed S-1 Flattop
The M16 rifle (officially designated Rifle, Caliber 5.56 mm, M16) is a family of assault rifles adapted from the ArmaLite AR-15 rifle for the United States military. The original M16 rifle was a 5.56×45mm automatic rifle with a 20-round magazine.
At closer ranges (typically inside 15–20 meters), the shooter must compensate by aiming high to place shots where desired. The standard AR-15 rifle has a 500 mm (19.69-inch) sight radius. [15] 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 Armalite AR-15 is the parent of a variety of Colt AR-15 and M16 rifle variants. History After World War II, the United States military started looking for a single automatic rifle to replace the M1 Garand , M1/M2 Carbines , M1918 Browning Automatic Rifle , M3 "Grease Gun" and Thompson submachine gun .
A derivative of the AR-16 was the AR-100 series. It came in four variants: the closed-bolt AR-101 rifle and AR-102 carbine, and the open-bolt fired AR-103 carbine and AR-104 light machine gun with ejecting magazines. ArmaLite intended the weapon to increase a squad's firepower and mobility. [17] It was never adopted but led to the Ultimax 100.
AR-15 with a Magpul Industries Angled Fore Grip (AFG®). Angled forward grips can provide similar functionality to vertical forward grips. They differ in that a vertical foregrip is more useful for "driving" the weapon, while an angled foregrip is more effective at pulling the weapon into the shooter's shoulder while keeping the offhand wrist in a comfortable and manageable position, which ...
The original AR15 and M16 designs lacked the "bolt forward assist" feature found on the later M16A1. [2] When hit, it pushes the bolt carrier forward, ensuring that the bolt is locked. In order to ensure that the extractor is clipped around the rim of the casing, the forward assist is usually struck rather than pushed.
Rifles styled like the AR-15 come in many sizes and have many options, depending on the manufacturer. The lower receiver, without the receiver extension, rear takedown pin, and buttstock, is shown at bottom. An AR-15–style rifle is a lightweight semi-automatic rifle based on or similar to the Colt AR-15 design.