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Facts About Your New Bushmaster Carbon 15 .22LR Rifle

The Bushmaster Carbon 15 .22 LR rifle system consists of a firearm, 10 round magazine, and instruction manual. It is a very light weight firearm – blow back operated, magazine fed, and operates in semi-automatic mode (i.e., a single shot fired each time the trigger is pulled). Retracting the charging handle cocks the internal hammer and compresses the recoil spring. When the charging handle is released, it moves the bolt forward (driven by the recoil spring), strips a cartridge from the magazine, and chambers the cartridge. The bolt is held against the chambered cartridge by the recoil spring.

When the trigger is pulled, the hammer is released and strikes the firing pin. The firing pin indents the cartridge case rim and ignites the priming compound inside the rim and a great volume of gas is instantly generated which acts on the cartridge case in all directions. The bullet moves out of the cartridge case, and exits the muzzle. The bolt then moves rearward automatically, extracting and ejecting the fired cartridge case, and at the same time cocking the hammer and compressing the recoil spring, as described above. Once the trigger is released the firearm is ready to fire again. The firearm will fire if there is a cartridge in the chamber whether or not there is a magazine place. The rifling is R.H. twist, 1 turn in 16” – 6 lands & grooves.


Getting Ready to Shoot:

  • With magazine well empty, pull back the charging handle and release to cock hammer so safety can be engaged.
  • Put safety lever on SAFE.
  • Insert the loaded magazine into the magazine well, always making sure the muzzle is pointed in a safe direction!
  • Pull charging handle to rear and release. Move safety lever from SAFE to FIRE.

Note: If the rifle is not going to be fired immediately, make sure the selector lever is still on safe.


Immediate Action in Case of Trouble…

If your rifle stops firing perform the following immediate actions…

  1. Remove the magazine.
  2. Pull charging handle all the way back.
  3. Check chamber for any obstruction or unfired cartridge.
  4. Insert the magazine and make sure it is seated properly.
  5. Pull the charging handle all the way back. RELEASE charging handle to feed a new round. Don’t ride the charging handle forward.
  6. Now fire. If the rifle won’t fire, look for trouble and apply remedial action.

Remedial Action…

If your rifle stops firing with a live round in the chamber of a hot barrel, remove the round fast. However, if you cannot remove it within 10 seconds, remove the magazine and wait 15 minutes with rifle pointing in a safe direction with the safety on during that time. This will help prevent injury if a round fires as a result of a hot barrel. Keep your face away from the ejection port while clearing a hot chamber.

  • If your Rifle still fails to fire after performing Steps 1 through 5 above, and check again for a jammed cartridge case.
  • If a cartridge case is in the chamber, open the receivers, remove the bolt carrier, and try to tap out the case with a cleaning rod.
  • If your rifle fails to fire, check the trouble shooting section in this manual - or take the rifle to a qualified gunsmith.

Bullet Stuck in the Bore…

If an audible “POP” or reduced recoil is experience during firing, IMMEDIATELY CEASE FIRE:


  • Remove the magazine
  • Lock the bolt to the rear
  • Place the selector lever on SAFE
  • Check for a bullet in the bore

Do not apply the “Immediate Actions” previously described.

If a bullet is stuck in the barrel of the weapon, do not try to remove it. Take the rifle to a qualified gunsmith.

Disassembly Of Firearm…

  • Make sure firearm is not loaded and is pointed in a safe direction.
  • Remove magazine and clear the chamber.
  • Open the bolt by pulling the charging handle completely to the rear. While holding the charging handle in this position, use your other hand to lock the bolt in the rearward position by pushing the lower end of the bolt catch lever.
  • The bolt carrier should lock in the rearward position. Push charging handle forward until it latches.
  • If there was a round in the chamber it should have been ejected...make sure there is not a round in the chamber by LOOKING INTO THE CHAMBER from THE EJECTION PORT AND VISUALLY CONFIRMING THAT THERE IS NOT A ROUND IN THE CHAMBER!
  • Now that you are sure the gun is unloaded, proceed in the disassembly.
  • Send the Bolt “Home” by releasing the Bolt Catch.
  • Rotate the takedown lever 160° counter - clockwise (See Diagram #1). Grasp the rifle and stock in opposite hands and firmly pull stock directly rearward. Do not attempt to fire the rifle with stock removed. To do so is unsafe and could cause bodily injury.
  • Unscrew the buffer tube and remove the recoil spring and buffer.
  • Use a small diameter drive tool, push both takedown pins from left to right until they stop.
  • Separate the receivers by holding the grip with one hand and pulling the upper receiver up and forward. Note: The charging handle must be in the closed position; there will be some resistance due to the close tolerance fit between the upper and lower receivers.
  • You may now pull back on the charging handle to remove the bolt carrier assembly.

Clean your rifle as soon as possible after firing, to make the job easier, and to avoid the development of any corrosion. When your firearm has not been fired, you should clean it at least once or twice a year if you live in a temperate climate, or as often
as once a week in a tropical climate. If you get your firearm wet, clean it as soon as possible. Use only high quality products which include a cleaning rod, swab holder, cotton flannel bore patches, pipe cleaners, a small toothbrush, brass wire bristle bore and chamber brushes, and CLP (Cleaner–Lubricant–Preservative). After disassembling the rifle/pistol, thoroughly clean, inspect and lubricate all parts according to the techniques described in this manual.


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