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A2-style front post [5] 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 ] Variants include the Bushmaster M4-type Carbine , Patrolman series, QRC series, Bushmaster XM15-E2S, and the Carbon 15 line.
FF Tube: Free-Float Tube; M4: Oval carbine handguards with double heatshields; Rail/RIS: Handguards are replaced with a Rail Integration System. Monolithic Rail Platform (MRP): A variant Rail System made by LMT. It has a free-floating barrel for greater accuracy. ACR Type: Advanced Combat Rifle Project Handguard
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 M-LOK rail specification included metric dimensions instead of imperial, and utilizes a T-slot nut capable of only 90-degree rotation, reinforced by thread-locking fluid, making it suited for applications on free-floating handguards. It was designed to work with both metal and polymer parts.
One of the biggest upgrades that may be implemented is the replacement of the standard flat-top upper receiver with standard handguards, handguard end cap and front sight base with a monolithic upper receiver with integrated aluminium quad-rail handguard for increased modularity with accessories and free-floating the barrel for augmented precision.
An angled foregrip was added to the handguard to improve handling as an automatic rifle. Rear sights later featured on the M16A2 were also introduced, and the weapon could only fire in fully automatic firing mode. Unlike many M16 variants, it fired from an open bolt, necessitating the removal of the forward assist for operating safety.
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Drum sights with an improved front sight, a flash-suppressor/muzzle brake capable of firing NATO standard grenades, a fixed solid plastic buttstock, and a plastic handguard that does not contact the free-floating barrel. The handguard came in a slim, ventilated version and a wide version. The latter allows for the attachment of a bipod.