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A2-style front post [5] Bushmaster Dissipator Model XM-15 rifle with aftermarket handguards The Bushmaster XM-15 used by the D.C. snipers during their attacks in October 2002 The Bushmaster XM-15 series (or XM15 [ 3 ] ) is a line of AR-15 style semi-automatic rifles and carbines manufactured by Bushmaster Firearms International, LLC . [ 2 ]
It uses an HK33 handguard, features drum sights, a retractable stock, and a 315 mm (12.4 in) barrel (reduced in length to the base of the front sight post), that is too short for use with a bayonet or rifle grenades. [7] G3KA4A1: Variant of the G3KA4 with a polymer grip assembly, ambidextrous trigger group and brass deflector.
Near the front of the forearm there is often an underside sling swivel stud and sometimes also a barrel-band to secure the forearm to the barrel (as seen in the photo). [ 1 ] [ 2 ] Some forearms are equipped with additional heat shields to protect the user from heat radiating from the barrel when the firearm is fired.
Fixed front iron sight, flip-up rear The Ruger AR-556 is a semiautomatic AR-15 style rifle manufactured by U.S. firearms company Sturm, Ruger & Co. Introduced in 2014 as an entry-level AR-15 using a direct impingement action, with variants since being released such as the upgraded AR-556 MPR (multi-purpose rifle) in 2017 [ 1 ] and the AR-556 ...
The MDNS (Miniature Day-Night Sight) program included the Block I Phased Replacement components and the Block II components [12] Daniel Defense M4A1 RIS II (Rail Interface System), GL/SSC RIS II (Grenade Launcher/Sound Suppressor Capable), and MK18 RIS II (with FSP (front sight post) variations) free-float handguards [7] [8] [9] [10]
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]
Steyr also offers 508 mm (20 in) barrel configurations fitted with a fixed, post front-sight used on the rifle version with aperture iron sights. [9] A 621 mm (24.4 in) heavy barrel with an integrated lightweight folding bipod with a closed-type ported muzzle device (combination of flash suppressor and compensator) is also available, primarily ...
Open sights generally use either a square post or a bead on a post for a front sight. To use the sight, the post or bead is positioned both vertically and horizontally in the center of the rear sight notch. For a center hold, the front sight is positioned on the center of the target, bisecting the target vertically and horizontally.