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The ArmaLite AR-15 [note 3] is a gas ... only rifles marketed to civilian and law ... weapon to various propellant and projectile or barrel length specific pressure ...
Barrel length Barrel profile Barrel twist Bayonet Lug Muzzle device R6000 AR-15 Sporter (SP1) A1 Triangular S-1 A1 No No .223 REM 20 in. A1 1:12 Yes Type 2 Duckbill or A1 R6001 AR-15 Sporter Carbine (SP1 Carbine) 2nd Generation Short Ribbed S-1 A1 No No .223 REM 16 in. A1 1:12 Yes A1 R6002 AR-15 Sporter (SP1; Bundled with 3× scope) A1 Triangular
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.
Gun laws in the United States regulate the sale, possession, and use of firearms and ammunition.State laws (and the laws of the District of Columbia and of the U.S. territories) vary considerably, and are independent of existing federal firearms laws, although they are sometimes broader or more limited in scope than the federal laws.
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.
An AR-15 pistol with an overall length of 26" or longer may have a vertical foregrip installed, as long as no buttstock is installed in conjunction with a shorter than 16" barrel. The Sig Sauer Pistol Braces (SBS and SBX) are commonly found on these AR-15 style pistols with vertical foregrips since they are not considered buttstocks. The ATF ...
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]
Short-barreled rifle (SBR) is a legal designation in the United States, referring to a shoulder-fired, rifled firearm, made from a rifle, with a barrel length of less than 16 in (41 cm) or overall length of less than 26 in (66 cm), or a handgun fitted with a buttstock and a barrel of less than 16 inches length.