Mossberg Changing Barrels - 93 - Manual (Page 2)

DISASSEMBLY
Move the safety button fully rearward to the “ON” (SAFE) position and
visually and physically check the chamber, elevator, and magazine tube
to be certain the firearm is unloaded before disassembling the firearm.
Wear eye protection during disassembly and cleaning.
BARREL REMOVAL
The action must be in the open position (bolt fully rearward).
1. Unscrew the magazine cap (Figure 9).
2. Slide forearm forward.
3. Pull the barrel forward, free of the receiver and magazine tube.
Figure 9
GAS SYSTEM REMOVAL
Remove the seal ring*, gas piston, spacer tube, pusher assembly, gas system
return spring, and forearm retainer from the magazine tube (Figure 10). Note the
orientation of the seal ring* for reassembly. The angled surface of the seal ring*
must face outward.
GAS PISTON
SPACER TUBE
PUSHER ASSEMBLY
RETURN SPRING
FOREARM RETAINER
SEAL RING*
*Seal ring is not used in all models
BARREL AND GAS SYSTEM RE-ASSEMBLY
Barrels are not interchangeable between model numbers, gauge or
capacity. 930
TM and 935 TM model barrels are interchangeable only with
barrels of the same model, gauge and capacity.
1. Grasp the operating handle and lock the action in the “OPEN” position (Figure 15).
2. Install the forearm retainer, gas system return spring, pusher assembly, spac-
er tube, gas piston, and seal ring* onto the magazine tube. Note the orienta-
tion of the seal ring*. Angled surface of the seal ring* must face out.
When interchanging barrels (combo models) or reinstalling the original
barrel onto the firearm, YOU MUST ensure that the gas piston and seal
ring* are present on the magazine tube prior to installing the barrel (see
Figure 15). If the gas piston and seal ring* are not present on the
magazine tube, remove them from the gas cylinder portion of the barrel
that was on the firearm previously and place them onto the magazine
tube as shown in Figure 15. Failure to do so may result in a dangerous
malfunction, damage to the firearm and injury to the shooter and other
persons. The firearm’s owner must accept full responsibility for the
correct reassembly and functioning of the firearm after any disassembly
or replacement of parts.
3. Install the barrel into the receiver and over the magazine tube. Continue to
push the barrel into the receiver until fully seated. If the barrel binds during
assembly, slide the gas piston forward, towards the gas cylinder. This should
allow the barrel to seat.
4. Install the forearm.
*Seal ring is not used in all models
Figure 15
Figure 10
5. Install magazine cap. Tighten cap hand-tight only.
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