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Attaching the barrel to the receiver using a barrel nut and a barrel with a shoulder is an alternative to action threads, which has been used in firearms such as the Sten gun and AR-15. Hand tools Quick barrel change systems is an increasingly popular alternative, as seen in for example SIG Sauer 200 STR, Roessler Titan or Blaser R8.
The quarter-turn T-slot nuts have different torque specifications depending on the handguard material: 4.0 N⋅m (35 lb⋅in) for attaching metal accessories to metal handguards. 1.7 N⋅m (15 lb⋅in) for attaching polymer or metal accessories to polymer handguards. 1.7 N⋅m (15 lb⋅in) for attaching polymer accessories to metal handguards.
For example on an AR-type rifle, the mil-spec distance from center of bore to top of rail is 1.211 inches, or approximately 31 mm (1.2 in). The mount height itself, that is the distance from the top of rail to center of scope, varies, but typically lies around 36–38 mm (1.4–1.5 in) (higher and lower mounts are also readily available).
The 18, 15, 11, 6, 3, and 2 gauge shells are the rarest of all; [10] owners of these types of rare shotguns will usually have their ammunition custom loaded by a specialist in rare and custom bores. The 14 gauge has not been loaded in the United States since the early 20th century, although the 2 + 9 ⁄ 16 -inch (65 mm) hull is still made in ...
The scope base is the attachment interface on the rifle's receiver, onto which the scope rings or scope mount are fixed. Early telescopic sights almost all have the rings that are fastened directly into tapped screw holes on the receiver, hence having no additional scope base other than the receiver top itself.
AR-15 Sporter (SP1; Bundled with 3× scope) A1 Triangular S-1 A1 No No .223 REM 20 in. A1 1:12 Yes A1 R6003 AR-15 Sporter Carbine (SP1 Carbine; Bundled with 3× scope) 2nd Generation Short Ribbed S-1 A1 No No .223 REM 16 in. A1 1:12 Yes A1 R6004 AR-15 Sporter (SP1; Bundled with Colt Reflex Sighting System) A1 Triangular S-1 A1 No No .223 REM
The 6.5mm Grendel is an intermediate cartridge jointly designed by British-American armorer Bill Alexander, competitive shooter Arne Brennan (of Houston, Texas) and Lapua ballistician Janne Pohjoispää, as a low-recoil, high-precision rifle cartridge specifically for the AR-15 platform at medium/long range (200–800 yard).
Generally the constriction ranges for chokes will be 0.00-1.15 mm (0.00-0.045 inch) while the constriction for relatively common turkey chokes may be as much as 2.50 mm (0.10 inch). Choke is measured experimentally by observing the percentage of pellets in a charge that impact inside a 75 cm circle at 35 m (25 m for "cylinder" and "Skeet"). [ 8 ]