LAGE MFG MAX-31A mk2 Manual de usuario
Owners Manual
MAX-31A mk2 Upper Receiver
LAGE Manufacturing, L.L.C. 916 E. Baseline Rd. Mesa AZ 85204 CM11-420, Rev.-
NFA Warning
This upper receiver is designed to be used with the SWD M-11A1 and RPB
M-11A1 .380 ACP submachine gun. NFA (National Firearms Act, Title 26,
United States Code) rules apply to its use and possession.
It is the owners/users responsibility to comply with all local, State and
Federal laws and regulations in the use of this product.
Copyright © 2014 by LAGE Manufacturing, L.L.C. All rights reserved. No portion of
this manual or any artwork contained herein may be reproduced in any shape or
form without the express written consent of LAGE Manufacturing, L.L.C.
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Description/Features
Features:
Length: 20-3/4”
Width: 2-1/4"
Height: 4-3/4”
Overall length with 8-1/2" stock- 28"
Weight: 3 pounds 11.7 ounces
1) Scope/Optics rail 16"
2) Cocking Handle (non-reciprocating)
3) Lower Accessory Rail 5-1/4"
4) Side Accessory Rail Mounting Points
5) 8-3/8 inch barrel length, removeable
(threaded 1/2-28)
6) Flash Suppressor
7) Mag catch
8) Trigger guard filler
(contains mag' catch and
mag' catch spring)
The MAX-31A mk2 Upper Receiver is designed to provide additional
capability to the M-11A1 submachinegun. Utilizing a heavy bolt and
longer bolt stroke, the rate of fire is reduced to around 770 rounds per
minute. This allows easy controllability of fire and the ability to consistently
fire single and two round bursts from the automatic setting.
The MAX-31A mk2 is designed to use Suomi M31 72 round drum and 50
round coffin magazines.
The MAX-31A mk2 will not function with the 36 round stick mag's which are
double feed.
The MAX-31A mk2 does not include removeable sights, scope or optics.
The MAX-31A mk2 attaches to the stock M-11A1 lower receiver without
any modification to the lower receiver.
Installation
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Insure firearm is unloaded. Point in a safe direction.
Remove magazine and pull bolt to the rear to insure
chamber is empty.
While holding cocking knob, pull trigger and ease bolt
forward into closed position.
Remove front pushpin and detach upper receiver from
lower receiver.
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Align retaining pin hole and install retaining pin.
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Make sure selector is set to "SMG". This drops the trip down
and makes it easier to install the upper. Hold upper
receiver with muzzle pointing down to prevent bolt
assembly from sliding out. Pull and hold trigger back while
installing the upper. Install upper by aligning the rear of
the upper receiver with the rear of the lower receiver,
keeping both receivers parallel. As you slide the upper
into the lower pay careful attention to not push the front
of the lower receiver into the trigger guard filler of the
upper receiver, or you may scratch the finish on your lower
receiver. If receiver will not install all of the way forward,
wiggle receiver up and down until it moves forward.
Operation
Use only full power 9mm ammunition such as Winchester
White Box 115 gr. Round Nose ammunition.
Using weak ammo will result in short uncontrolled bursts of
3 to 5 rounds. If you are unsure of your ammunition, only
load 10 rounds in the magazine and test to see if it
continues to shoot after releasing the trigger.
Do not use steel cased ammo in the 50 round Suomi coffin
magazines. The increased friction of the steel cases will
cause feed jams. Steel cased ammo will work fine in the
drum magazines.
Removal
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Point firearm in a safe direction and ensure it is unloaded
and magazine is removed.
Hold gun with muzzle pointing down and remove retaining
pin.
Pull lower receiver back about an 1/8", then pull trigger
and hold. While holding trigger back, pull lower receiver
downward and back to remove.
Recommended ammunition:
Extra magazines can be purchased from:
Vegas Drums
702-763-1269 Sales
702-706-4GUN Information
Centerfire Systems
102 Fieldview Dr.
Versailles, KY 40383
www.centerfiresystems.com
1-800-950-1231
Due to vartiations in magazines, some magazines may be
a snug fit but most will fit loosely. The magazine may have
a lot of play after installation, but this will not affect
functioning of the MAX-31A mk2.
Cock gun first before installing magazine.
Insert loaded magazine into mag well.
Load magazine:
Rate of fire is dependent upon ammunition being used.
"Hotter" ammo will run faster and weaker ammo will run
slower. Winchester White Box ammo will run at
approximately 770 RPM.
Note:
Cocking assembly may slightly bind when first used. With
use and lubrication, it will feel smoother.
If gun jams with the bolt forced closed, do not force the
cocking knob or hit it with a hammer. Remove upper
receiver from lower receiver. Use a screw driver to to
depress the rear of the extractor and release the case rim.
Remove the bolt assembly, then use a cleaning rod or
dowel from the muzzle end to tap the bullet out.
Pull cocking knob to rear and release. Bolt will remain
open.
Cocking knob has a spring return and will return forward
after release.
Cocking knob is non-reciprocating and will remain forward
when firing.
Cocking
Centerfire Systems
Part Number #M31DRUM
Condition of magazines- magazines are of varying quality
due to the fact that they are surplus military magazines.
Steel surface may show pitting, wear marks or light
scratches. Magazine is coated with grease. Make sure
you clean the inside thoroughly before loading.
Recommended source for magazines:
A full length rail for mounting a scope or other aiming
device is located on the top of the upper receiver. The rail
profile is compatible with most scope mounts, however,
square shaped recoil lugs may not work. These are
typically found on quick detach, throw lever mounts such
as LaRue Tactical mounts. UTG quick detach mounts are
compatible as well as others. When installing a mount, do
not force it or you may damage the upper receiver
accessory rail.
Scope/Optics Rail
A rail for attaching a front hand grip, laser aiming device,
tactical flashight or other device is attached to the
bottom of the front handgrip. Please note, some hand
grips are not manufactured to the correct dimensions to
mount on a Mil-Std-1913 rail. Ensure the grip is correct
before attaching. Additionally, tactical flashlights
designed for use with pistol accessory rails will fit on the
accessory rail but will be a tighter fit. If the item you are
going to install needs to slide on from the front,you can
remove the two screws that hold the front cover on, pull it
forward and rotate it out of the way. You can then slide
on your grip, laser, light, etc. and re-install the front cover.
Make sure you use Blue Loctite to secure the threads.
Lower Accessory Rail
The MAX-31A mk2 can be fitted with left and right side
accessory rails for mounting additional accessories. They
are installed by using the threaded holes on the sidesof
the foregrip. Screw threads are #10-32. When installing
the screws, use Loctite 242 on the threads and be careful
not to overtighten the screws.
Side Accessory Rails (optional)
Attachment of other muzzle devices
The barrel is threaded 1/2-28. The flash suppressor is
torqued to 25 foot/pounds and secured with Loctite
Threadlocker 242 A lockwasher is intentionally not used in
order to ensure the mounting surface of the barrel remains
square and burr free for optional use with a suppressor. If
you choose to replace the flash suppressor with another
type of muzzle device, insure it is designed for use with
9mm caliber bullets.
To prevent marring of the finish, apply masking tape to the
flats on the barrel end and the flash suppressor. To
remove the flash suppressor, attach a ¾" open end
wrench to the wrench flats on the barrel. Attach a
second ¾" open end wrench to the wrench flats on the
flash suppressor. While holding the wrench attached to
the barrel stationary, rotate the wrench attached to the
flash suppressor counter-clockwise.
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