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and remove the barrel. The trunnion will come loose after
removal of the barrel. To prevent loss or misplacement of
the trunnion, insert a 10-32 screw into the accessory rail
hole to keep trunnion in place after the barrel has been
loosened and removed from the vice.
To re-install barrel, replace trunnion into the body, beveled
side forward with largest bevel down towards retaining pin
hole. Place a snap cap round into the extractor in the bolt
for barrel alignment. Replace bolt and use it to keep the
trunnion in place. Apply Loctite Threadlocker 242 to the
barrel threads and insert barrel into trunnion while apply-
ing pressure to the back of the recoil assembly. Hand
thread barrel and tighten by turning the wrench clock-
wise. Use a torque wrench to tighten to 40 foot/pounds.
Variable Buffer System, VBS (optional)
To adjust the rate of fire, the MAX-31A mk2 is designed to
use a varaible buffer system. (VBS)The VBS consists of a
buffer spacer that can be placed on the bolt assembly
between the rear of the bolt and the rubber buffer.
The following rates of fire can be achieved:
Configuration:
Standard Bolt
One VBS Spacer installed
Different bullet weights, such as 124 gr. And 147 gr. , as
well as lighter or stronger powered ammunition, will result
in slower or faster rates of fire. The rates of fire above are
approximate. The rate of fire of your ammunition may
vary.
VBS
Recoil Plate
Rate of Fire with
Winchester 115 gr Ammo
Rubber
1 VBS Installed
Buffer
770
840
Rate of Fire with
Federal 115 gr Ammo
700
760
Ejector Rod
.
Bolt
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