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Attachment of a Sound Suppressor
A sound suppressor may be attached to the MAX-31A mk2
by removing the flash suppressor. The threads on the
MAX-31A mk2 barrel are 1/2-28. A thread adapter can be
used to couple suppressors with other thread sizes or
mounting systems. Most commonly, a 1/2-28 to 3/4-10
thread adapter is required to use the suppressor that mates
to the stock M-11A1. When using the suppressor with the
thread adapter, regularly tighten the suppressor to the
thread adapter. It will have a tendency to loosen during
firing. This is typical of the 3/4-10 mounting thread and is
not related to the design of the MAX-31A upper receiver.
The recommended supplier for thread adapters is TROS
USA. Remove the flash suppressor per the above
procedure and install the thread adapter per the
manufacturers' instructions.
CAUTION: Due to the possible variance in the
concentricity and squareness of the combined barrel,
thread adapter and suppressor you will be using, it is
recommended that thread adapters be installed by a
qualified gunsmith and the mounted suppressor be
inspected for alignment prior to firing. Additionally, some
suppressor manufacturers warranties expressly require that
they thread the barrel for the firearm that their suppressor
will be used on. The warranty for the MAX-31A mk2 Slowfire
Upper Receiver applies only to the upper receiver
assembly and not any accessories subsequently attached
by the Customer.
Removal of Barrel
The barrel has been designed to allow easy removal and
installation. There are ¾" wrench flats at the muzzle end.
To prevent marring the finish of the upper receiver use a
padded vise or hard wood inserts. Clamp the front sides
of the upper behind the front cover mounting screws.
Using a 3/4" open end wrench on the wrench flats at the
muzzle end, turn the wrench counter clockwise to loosen
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