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Also available as a military or LE select-fire version. Patrolman Series: - 7" or 10.5" barrel "pistol" version with a free-float handguard and no stock.QRC is chambered in 5.56x45mm with a 1:8 twist melonite coated barrel, M16 style bolt carrier group & mil-spec buffer tube. QRC Series: Formerly known as ORC ("optics ready carbine"), but now styled as QRC ("quick response carbine"), are flat-top rifles without iron sights, provided with a simple 1x20 red-dot optic.This mounts a false gas block with a front sight at the 20" position with the real gas block in the carbine position and concealed under a rifle-length 12" handguard. E2S Dissipator - Variant with a Bushmaster-designed 16-inch "Dissipator" barrel.E2S Shorty AK - Shorty variant with 14.5-inch carbine SBR barrel with an AK-74-style muzzle brake permanently welded to the end to increase the overall length to 16 inches.E2S Shorty - 16-inch version with a "shorty" handguard.E2S Target - 20" heavy-barrel target rifle with A2-style stock and carry handle upper, also available with 24" and 26" barrels.E2S Series: The basic E2S is fitted with a 16-inch carbine-style barrel.
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The standard barrel has rifling of 1 turn in 9". In Bushmaster's 2016 sales brochure, all new-production XM-15s are stated to be supplied with a 4150 steel barrel. Barrels of XM-15 firearms have a heavy profile and are hard chrome-lined 4150 alloy steel or 416 stainless steel. The standard XM-15 has a forged 7075T6 aircraft-grade aluminum upper and lower receiver. Variants include the Bushmaster M4-type Carbine, Patrolman series, QRC series, Bushmaster XM15-E2S and the Carbon 15 line.
HANDGUARD CAP FOR M4A3 BUSHMASTER SERIES
The Bushmaster XM-15 series (or XM15 ) is a line of AR-15 style semi-automatic rifles, and carbines, manufactured by Bushmaster Firearms International.