Manual

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NOTE: Standard carbines use the standard unmarked buffer.
All piston operated rifles use the H2 buffer. The LM308MWS
uses the H3 buffer.
BARREL REMOVAL AND INSTALLATION (REFER TO FIGURE 5A)
• Removing Barrel from Upper Receiver
o NOTE: BARREL MUST BE COOL TO THE TOUCH BEFORE PROCEEDING WITH BARREL
REMOVAL AND INSTALLATION.
o If a carrier group exists, remove it from the upper receiver.
o Using a T-30 Torx wrench, remove the front bolt (1) from the receiver. Proceed to the rear
bolt (2) and loosen using three complete turns. ***Note, the screw does not need to be
removed.***
o Grasp the muzzle end of the barrel and pull the barrel from the receiver.
• Installing the MRP™ Weapon System Barrel into the Upper Receiver
o If a carrier group exists, remove it from the upper receiver. Slide the replacement barrel into
the upper receiver. Be sure that the gas tube is in the 12 o’clock position. After the barrel is
fully inserted into the receiver, install the front bolt (1) into the receiver. Using the pre-set
torque wrench which was supplied with the original purchase of the rifle, tighten the front bolt
(1) to 140 inch pounds. Proceed to the rear bolt (2) and follow the above instructions.
ASSEMBLY AND DISASSEMBLY PISTON SYSTEM
• To disassemble, depress the plunger while rotating the plug in the direction indicated (counter
clockwise from the direction of the breech) until the locking lug is in position to allow the removal of the
plug (approximately 90°).