Description
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.[1][3] In Bushmaster’s 2016 sales brochure, all new-production XM-15s are stated to be supplied with a 4150 steel barrel.[4] The standard barrel has rifling of 1 turn in 9″.[2]
- E2S Series: The basic E2S is fitted with a 16-inch carbine-style barrel.
- E2S Target[5] – 20″ heavy-barrel target rifle with A2-style stock and carry handle upper, also available with 24″ and 26″ barrels.
- E2S Shorty[6] – 16-inch version with a “shorty” handguard.[5]
- E2S Shorty AK[6] – 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 Dissipator[6] – Variant with a Bushmaster-designed 16-inch “Dissipator” barrel. 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.
- 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 1×20 red-dot optic. QRC is chambered in 5.56x45mm with a 1:8 twist melonite coated barrel, M16 style bolt carrier group & mil-spec buffer tube.
- Patrolman Series:[5] – 7″ or 10.5″ barrel “pistol” version with a free-float handguard and no stock. Also available as a military or LE select-fire version.
- Bushmaster M4-Type Carbine
