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COMPONENT VARIATIONS… within the Bushmaster Weapon System

This manual is intended to instruct the Bushmaster Rifle Operator in all necessary aspects of Maintenance, Disassembly, Reassembly, Operation and Troubleshooting of any Bushmaster Rifle. Within the Bushmaster Weapon System, there can be infinite variations of Barrel Length, Stock Type, Receiver, Forend and Sights.

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For purposes of this manual, the most common Bushmaster Model sold - the M4A3 Type Carbine - has been illustrated and photographed. A Parts Schematic for this model is shown below - many parts are common to all models in the Bushmaster System. The Bushmaster you own, or are using, may vary in appearance from the photographs and illustrations in this Manual, but the concepts, procedures and practices recommended in this Manual are universal to the Bushmaster Weapon System.

PARTS SCHEMATIC… Typical Bushmaster XM15 M4A3 Type Carbine

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PARTS SCHEMATIC… Typical Bushmaster XM15 M4A3 Type Carbine (Continued)

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NOTE: See Carbon 15 Models – Differences for comparison and instructions specific to Disassembly and Maintenance for
those Models.

PARTS SCHEMATIC… Typical XM15 A2 Type Target Rifle

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PARTS SCHEMATIC… Typical XM15 A2 Type Target Rifle (Continued)

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NOTE: See Carbon 15 Models – Differences for comparison and instructions specific to Disassembly and Maintenance for those Models.

PARTS SCHEMATIC… Typical Carbon 15 Rifle & Pistol

Schematic for Carbon 15 Type R97 Rifle and Carbon 15 Type P97 Pistol

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PARTS SCHEMATIC… Typical Carbon 15 Rifle & Pistol (Continued)

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Note: For Carbon 15 “Flat-top & M4 Models, refer to previous XM15 E2S M4 Carbine diagram. The differences would be the substitution of molded Carbon 15 Receivers in place of forged aluminum receivers.

Bushmaster Carbon 15 Models – Differences…

Carbon 15 Sighting Systems: Sights on Carbon 15 Rifles and Pistols vary from traditional AR-15 Type Rifle systems as shown below. All Rails on Carbon 15 Upper Receivers are machined from hard anodized aircraft aluminum in Picatinny configuration, and will accept a wide variety of scopes, optics, holographic, and red dot sights.

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Carbon 15 Upper & Lower Receivers:

Beside the fact that they are molded Carbon Fiber material, the Upper and Lower Receivers on Carbon 15 Rifles and Pistols in the
“R” or “P” Series Models separate from each other in a different manner than XM15 E2S Bushmaster models with Aluminum Receivers. The disassembly steps are:

  1. Weapon should be in a SAFE CONDITION. Clear Rifle (or Pistol) and remove Magazine. Make sure Bolt Carrier is fully forward and locked.
  2. Push both Takedown and Pivot Pins out from left side of Lower Receiver.
  3. Grasping the Lower by the Pistol grip and the Upper by the Forend as shown, tilt the front end of the Upper so that Pivot Pin Lug clears the Lower Receiver.
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  4. This will allow you to move the Upper forward - separating it from the Lower - while at the same time releasing the Buffer and the Action Spring from the Buffer Tube. Use Caution as the Action Spring will be under some tension.
  5. Reassembly is the reverse of these steps.

NOTE: These instructions apply specifically to these Models:

  • R97S Rifle (AZ-C15R97S)
  • R97 Rifle (AZ-C15R97)
  • R21 Rifle (AZ-C15R21)
  • “Lady” Rifle (AZ-C15R21C)
  • P97S Pistol (AZ-C15P97S)
  • P21S Pistol (AZ-C15P21S)
  • P97 Pistol (AZ-C15P97)
  • P21 Pistol (AZ-C15P21)

Carbon 15 Rifle Buttstock Removal:

The molded Carbon Fiber Buttstocks on “R” Series Rifles can be easily removed from the Lower Receiver for more convenient storage or cleaning, or to gain access to the Buffer Tube. The disassembly steps are:

  1. Weapon should be in SAFE CONDITION. Clear the Rifle and remove Magazine. Make sure Bolt Carrier is fully forward and locked.
  2. Identify the Buttstock Takedown Lever on the left side of Lower Receiver.
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  3. Use your finger or thumb to swivel the Buttstock Takedown Lever downward in a counterclockwise rotation to the “release” position.
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  4. This will allow you to slide the Buttstock off the Buffer Tube and Lower Receiver.
  5. Reassembly is the reverse of these steps. Be sure the Buttstock Takedown Lever is in the “release” position before attempting reinstallation.
  6. Carbon 15 R97S Rifle and Buttstock shown completely separated below. Do not attempt to fire the rifle without the Buttstock securly in place. You could experience injury from recoil, or loss of control of the rifle.
    xm15_c15_122-schematics-11.png

NOTE: A Youth sized Buttstock is available (2” shorter than standard - Part# AZ15279) to make shooting more comfortable for younger shooters and smaller women.

NOTE: Buttstock removal applies specifically to these Models:

  • R97S Rifle (AZ-C15R97S)
  • R97 Rifle (AZ-C15R97)
  • R21 Rifle (AZ-C15R21)
  • “Lady” Rifle (AZ-C15R21C)

Quick Detach Compensator Removal:

The Stainless Steel Barrels on Carbon 15 “R” Series Rifles and P Series Pistols are fitted with an easily removed Quick Detach Compensator. The disassembly steps are:

  1. Weapon should be in SAFE CONDITION. Clear the Rifle and remove Magazine.
  2. Grasp the Sliding Collar of the Q.D. Compensator and push it towards the muzzle end while holding the body of the Compensator.
  3. Once spring tension is released on the Ball Detent Locking mechanism, the Compensator can be slide off the end of the muzzle.
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  4. Reassembly is the reverse of these steps plus a twisting motion to ensure that the Balls of the Locking mechanism drop into their respective detents on the outside of the muzzle.

WARNING: Do not fire the Rifle unless the Q.D. Compensator is firmly locked in place.

NOTE: The Rifle may be safely fired with the Q.D. Compensator completely removed.

Carbon 15 Rifle Safety Lever Markings:

Molded Carbon Fiber Receivers on Carbon 15 Rifles and Pistols have Safety Lever Indicator Markings either engraved into the Carbon Fiber material (most military / LE models), or inset into the Lower with colored letters (most Commercial models). S = SAFE (white
letters on both sides of Receiver); F = FIRE (red letters on both sides of Receiver). Compare with roll-stamped markings on
Aluminum Receiver at right.

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No Ejection Port Cover on Carbon 15 Rifles & Pistols:

While the Aluminum Receiver XM15 Models include the original military design, spring loaded, metal Ejection Port Cover, the Receivers on Carbon 15 Rifles and Pistols do not. The Bolt Carrier can be easily removed for cleaning and maintenance, so the Ejection Port Cover is not found on the Carbon 15 Models. 

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