NFA Warning

This upper receiver is designed to be used with the SWD M-11/9 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.
Possession of this upper receiver with a semi-auto M-11/9 lower receiver is illegal and potentially dangerous.

MAX-31 mk2 Upper Receiver

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MAX-31 mk2 Upper Receiver

Description PRICE
Slow fire upper receiver for use with the M-11/9 SMG. Uses 72 and 50 round Suomi M31 9mm magazines. #504 $895.00

IN STOCK!
MAX-31 mk2 YouTube Video

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Shockwave 30-Round ZMAG-S for Suomi Magwell Upper Receivers

Description PRICE
30 round steel magazine for the MAX-31, MAX-31 mk2, MAX-31A, MAX-31A mk2 and MAX-31k. Also works in original Suomi M31 and K31 machine guns as well as the semi-auto versions of these guns. Shipping restrictions apply.
1 ZMAG-S 30 round Magazine. #ZMAG-S $47.95
6 Pack. ZMAG 30 round Magazine. #ZMAG-S-6 $240.70
12 Pack. ZMAG 30 round Magazine. #ZMAG-S-12
$472.40


Lage Fixed Sights

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Front and rear fixed sights

Description PRICE
These front and rear fixed sights machined from 6061 Aluminum and finished in black anodize. Front and rear sight hardware are standard M16-A1 parts. Sights are designed to be used with an Aimpoint T1 sized scope (or Primary Arms) with a 1/2" riser. Sights cowitness in the lower 1/3, in this configuration. Sight line is 1.025" above top of Picatinny rail. Rear sight weighs 1.7 oz. Front sight weighs 1.0 oz. #238 $119.98


VBS

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Variable Buffer System

Description PRICE
The VBS is a Variable Buffer System consisting of two buffer spacers. When installed in the MAX-31 mk2, the rate of fire can be easily changed.

  • Optional Rates of Fire with Variable Buffer System (VBS):
    • Winchester White Box 115 Gr. FMJ-
      One VBS Spacer installed- 830 RPM
      Two VBS Spacers installed- 840 RPM
    • Federal 115 Gr. FMJ-
      One VBS Spacer installed- 710 RPM
      Two VBS Spacers installed- 800 RPM
    • 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.

      The VBS easily installs on your bolt assembly by simply installing it between the rubber buffer and the back of the bolt assembly. It is securely held in place with the ejector rod.

      The VBS-2 is priced at $20.00 and includes two spacers. #424 Individual spacers can be purchased for $10.00 each. #421A

  • $20.00
    VBS-1
    Single Buffer
    $10.00


    Side Accessory Rails

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    Side Accessory Rails

    Description PRICE
    Left and right side accessory rails for attaching additional accessories to the sides of the MAX-31 mk2 Upper Receiver such as flashlights or lasers. Made from 6061 aluminum and finished in hard coat black anodize. 5" long, 10 slots. All mounting hardware provided. #404 $59.99


    K-Grip

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    Forward Canted K-Grip, Clamp On

    Description PRICE
    This clamp on K-Grip attaches to any M1913 Picatinny rail. The canted angle allows a natural shooting stance which is more comfortable than a straight vertical grip. The clamp is made from 6061 aluminum and finished in black anodize. The grip portion is made from black polymer and will stay cool during extended shooting sessions. #419A $49.99


    Barrels

    The MAX-31 mk2 comes standard with a 1/2-28 threaded barrel and an 9mm "Bird Cage" flash hider installed. These barrels are for if you need a replacement or different barrel thread for use with a suppressor. You can purchase your MAX-31 with any of these barrels, instead of the standard, for an additional charge.

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    8-3/8" Replacement Barrel

    Description PRICE
    Made from 4140 Chrome Moly steel, these 8-3/8" long barrels are finished in black oxide. Muzzle threaded 1/2-28. #44 $86.00

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    9mm Flash Suppressor, 1/2-28 Thread

    Description PRICE
    M16-A1 Birdcage Style Flash Hider. Bored out for use with 9mm. These are the standard flash hiders installed on our 1/2-28 threaded barrels. #65 $15.00

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    HK 3-Lug Adapter, 1/2-28 Thread

    Description PRICE
    HK 3-Lug adapter threaded 1/2-28. We sell dedicated 3-Lug barrels for the MAX-11 mk2, MAX-31 mk2 and MAX-31A mk2. If you already have one of our 1/2-28 threaded barrels, standard on these upper receivers, you can add this adapter to use your 3-Lug suppressor. Mounts to any 1/2-28 threaded barrel muzzle. #610 $60.00

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    8-5/8" Barrel, 3/4-10 Thread

    Description PRICE
    Made from 4140 Chrome Moly steel and finished in black oxide, these 8-5/8 inch barrels are threaded 3/4-10 on the muzzle for use with the standard M-11/9 suppressor. #64 $106.00

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    8-3/4" Barrel, 3-Lug

    Description PRICE
    Made from 4140 Chrome Moly steel, these 8-3/4 inch barrels are finished in black oxide. Muzzle end has a 3-lug machined on the end. #59 $184.00


    Bolt Assemblies

    The MAX-31 mk2 comes standard with a 770 RPM bolt assembly installed. This bolt is a replacement bolt assembly or can be purchased as a spare. Changing the bolt is as simple as removing the MAX-31 mk2 upper receiver from your M-11/9 lower receiver, sliding out the existing bolt and sliding in the new bolt.

  • Rate of fire:

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    Standard Bolt Assembly

    Description PRICE
    Replacement Bolt Assembly for the MAX-31 mk2. Rate of fire is approximately 670 RPM with Federal 115 gr. ammo or 770 RPM with Winchester 115 gr. ammo. #512A $245.00


    Stocks


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    Fixed Buttstock, 7-1/2"

    Description PRICE
    This durable black polymer buttstock is designed for use with the MAX-31. This buttstock features a sling mount on the top rear of the buttstock. Easily installs with one screw and a threaded block that drops inside the lower receiver. Measures 7-1/2" from rear of receiver to end of buttpad. Length from backstrap of grip to buttpad is 11-1/8". Also available in 1" or 2" longer length. Weighs 8.4 Ounces.
    7-1/2" Stock. #303
    (Recommended Length)
    $79.00
    8-1/2" Stock. #304 $79.00
    9-1/2" Stock. #305 $79.00

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    "k" Folding Stock

    Description Projected PRICE
    This Folding Stock was originally designed for our MAX-11k upper receiver, but it is compatible with all of our uppers and aftermarket M-11/9 upper receivers with taller sights than the OEM upper.

    This stock features a folding mechanism that folds the stock down at a three degree angle to provide a generous clearance around the cocking knob on the left side of the upper receiver. It is designed with a thinner profile to fold very flat and provide a slim package. The folding stock mechanism and stock cheek bar are made from black anodized 6061 aluminum and the buttpad is made from black polymer. The stock adapter that attaches to the lower receiver of the M-11/9 is made from steel and is finished in manganese phosphate. Length from the butt to the rear of the stock adapter plate is 9-1/2". Available in lengths as short as 8". #327A
    $235.00

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    Left Folding Buttstock, 7-1/2"

    Description PRICE
    This durable black polymer buttstock is is designed for use with the MAX-31 upper receiver. This left folding buttstock features a sling mount on the top rear of the buttstock. When folded, it will not interfere with operation of the subgun. Easily un-folds and solidly locks in place. Installs with one screw and a threaded block that drops inside the lower receiver. Measures 7-1/2" from rear of receiver to end of buttpad. Length from backstrap of grip to buttpad is 11-1/4". Also available in 1" or 2" longer length. Weighs 12.5 Ounces.
    7-1/2" Folding Stock. #309
    (Recommended Length)
    $209.99
    8-1/2" Folding Stock. #310 $209.99
    9-1/2" Folding Stock. #311 $209.99

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    Collapsible Buttstock

    Description PRICE
    This collapsible stock is a drop-in replacement for the wire form stock that comes with the M-11/9. Sturdy construction will not fold up in use. Two extendable positions to allow for heavy clothing, tactical vest or smaller shooters. #30 $99.00

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    Canted Stock Adapter

    Description PRICE
    Canted Stock Adapter is designed for use with our Folding Stock Mechanism to allow the butt stock to swing low and out of the way of the cocking knob. This provides greater clearance around the cocking knob, makng it easier to access. The Canted Stock Adapter consists of two angled shims. One is placed between the folding mechanism and the stock adapter and the other is placed between the folding stock mechanism and the stock. #326A $24.99

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    ACE Rifle Stock Adapter

    Description PRICE
    This stock adapter is designed for use with the aftermarket M-11A1 upper receivers with higher sights or optics. Allows use of buttstocks manufactured by ACE LTD. USA. #32 $79.00

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    AR15 Stock Adapter, M-11/9, M-11A1

    Description PRICE
    This stock adapter is designed for use with the MAX-11 mk2, MAX-31 mk2 and MAX-31A mk2 Upper Receivers or other receivers with higher sight lines or scopes attached. Attaches to M-11/9 or M-11A1 lower receiver. Allows use of AR-15 buttstocks. 1/2" of vertical adjustment. #611 $109.00

    Lage Folding Stock Mechanisms (FSM)

    The Lage Folding Stock Mechanism (FSM)fits between the Stock Adapter and Stock. Lage FSMs are designed to be easier to open than competitors' designs. Wrap your fingers around the stock and put your thumb on top of the hinge pin and squeeze. Easily pops open. Locks in open or closed position, pull from the side to deploy.

    Our FSMs are manufactured with the Boss. Must be used with a stock adapter with a pocket machined for the Boss.



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    Lage Folding Stock Mechanism, Left or Right Folding

    Description PRICE
    The FSM can be mounted to fold either left or right. Will add .83” to your LOP. Weighs 3.5 oz. Manufactured from 6061 aluminum and finished in black anodize. Made in the U.S.A. Lage P/N: FSM1 $59.99

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    ACE Folding Stock Mechanism

    Description PRICE
    Folding Stock Mechanism (FSM). This is the same FSM used in our folding stocks. The FSM is the standard Folding Stock Mechanism. It fits between the Stock Adapter and Stock. The FSM can be mounted to fold either left or right. Will add .75” to your LOP and weighs 3.5 oz.The FSM is manufactured with the Boss. The Boss is the raised (oblong shaped) portion on the Arm (small side). ACE P/N: A500. #ACEFSM $59.99


    Accessories

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    Suomi Drum Magazine Carrier

    Description PRICE
    Designed to attach to a GI web belt or MOLLE vest, these magazine carriers allow quick and easy magazine changes while also securely holding the magazine. Run, jump, squat or crawl and the magazines will not bounce out of the carrier. Spring tension of the magazine carrier can be adjusted by squeezing it together or pulling it further apart. Magazines are easily removed by pulling straight up, close to your body. Two ALICE clips are attached to the back for mounting the carrier to your belt or vest. #178 $40.00
    Mag' Carrier YouTube Video


    Note: All prices are subject to change without notice.