Operating and Safety Manual

ABOUT YOUR BUSHMASTER RIFLE…
This Operating Manual covers the Bushmaster ACR (“ACR”) which is chambered in 5.56mm NATO/223
Remington and 6.8mm Remington SPC ammunition. It is a gas piston, air-cooled shoulder fired, magazine-
fed Firearm, that is
Semi-Automatic in operation (i.e., a single round will fire each time the trigger is pulled).
• The ACR Barrels are cold hammer forged and hold the tightest tolerance allowed. They are rifled with either a
1 turn in 7” for heavier grain weight bullets or 1 turn in 9” for lighter bullets with a right hand twist – 6 lands and
grooves.
• The ACR is operated by a regulated, short-stroke Gas Piston System which eliminates hot gas from being in-
troduced into the Upper and Lower Receivers. The Regulator can be set for Unsuppressed or Suppressed fire.
• The ACR is a multi-caliber platform and is capable of transitioning to a range of calibers simply by swapping
the Barrel Assembly and Bolt, using the appropriate Magazine. Some calibers may require an alternate lower
to accept different sized Magazines.
• All ACR Upper and Lower Receivers are easily opened for cleaning and inspection.
• The Upper Receiver is made of extruded Aluminum and the Lower Receiver is made of a proprietary
composite polymer.
• Most ACR models feature fully adjustable rear sights/elevation adjustable front sights.
• The Bolt Group locks into the Barrel Extension with 7 locking lugs.
• All models can be configured with either a Fixed Stock or 7 position Telescoping/Folding Stock.
• All models feature vertical pistol grips and detachable magazines. Magazine capacity is 30 rounds standard
(depending on State Regulations), but all AR-15/M-16 type magazines of capacities from 5 to 40 rounds will fit
the ACR and function in it.
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