Stemple Takedown Gun (STG) U45/U9SF Package with Suppressor

Product Description

U45/U9 Package

---------------------------

This package is a subgunner's dream.  All in one box you've got a complete package to shoot 45ACP with Grease Gun mags or 9mm with Suomi drums and one suppressor to work with both calibers.  Switching calibers simply requires changing the bolt, barrel, and magazine housing.  It features a simple, smooth-running blow-back system.   With the addition of a hydraulic buffer, these are the most smooth, controllable, and versatile subguns on the transferable market.  It's so smooth due to the weight, layout, and action; you can actually watch your target being hit through a 4x scope while shooting long bursts.   This setup utilizes AR pattern stocks, AR pattern grips, and multiple picatinny mount options for maximum versatility.  This gun is also ideal for use with a suppressor. The extra bolt weight drastically slows the initial bolt blow-back thereby significantly reducing port noise common in open-bolt / blow-back SMGs.

The package includes the following parts: 

• Stemple (STG) U45 Machine Gun with Low-Recoil Bolt System: Variable weight bolt system with hydraulic buffer that allows shooters to customize performance with a variety of different ammo as well as the 45 to 9mm caliber conversion.

• 2 x M3 Grease Gun 30rd Magazines

• U9 Conversion (bolt, barrel, magazine housing)

• 2 x Suomi 70rd Drums

• 1 x Suomi 36rd Magazine

• Custom Hard Case

• 45 ACP suppressor for use with both 45 ACP and 9mm setups:  

• multi-tool

  (sights not included)

U45 Data

Select-Fire with Quick-Change Barrel

Ultra-smooth adjustable-weight bolt system with hydraulic buffering for slow M3 Grease-Gun-like shooting performance 

Magazine: M3 Grease Gun (unmodified) 30 rds

Nickel Boron Plating on Aluminum Parts and Bolt

Weight: 9.3 lbs

Cycle Rate: 500-750 adjustable system with hydraulic buffer, Select Fire (safe-semi-full)

Barrel Length: 10.35" threaded .578"-28 or 5/8"-24, or 3-lug setup, to use common suppressor

U9 (SF) Conversion Data:

Select-Fire with Quick-Change Barrel

Ultra-smooth adjustable-weight bolt system with hydraulic buffering 

Magazine: Suomi KP31 25 rd, 36 rd, 50 rd magazines and 40 rd & 70 rd drums

Nickel Boron Plating Aluminum Parts and Bolt

Weight: 9.3 lbs

Cycle Rate: 550-800 adjustable 

Stainless Steel Barrel

Barrel Length: 10.35" threaded .578"-28 or 1/2"-28, or 3-lug setup to use common suppressor.  Other shroud and barrel setups are also available.

Transferable

In 2003, the original inventor, John Stemple collaborated with BRP Corp to make new and replacement parts for the Stemple 76/45 receivers he manufactured prior to the 1986 cutoff.  From this came a series of compatible drop-on parts for the unmodified/transferable Stemple 76/45 receivers known as Stemple Takedown Gun (STG) setups.  Since nothing is welded or hand fitted to these receivers, changing setups and replacing parts is fast and easy.  These are the most finely built and smooth running sub-machine guns on the transferable market.  We build them for performance and durability, stock plenty of high-quality spare parts, and provide excellent service.  There is only a limited number of these pre-1986 registered/transferable machine guns remaining, so get one while they last.

They are ‘new’

Well, the receivers are nearly 40 years old but the Stemple Takedown Gun (STG) setups are complete new parts packages installed on unused pre-1986 transferable Stemple 76/45 machine gun receivers.

Simple / Durable Design

Our guns are very difficult to break and very easy to fix. They are simple blow-back guns and very smooth-running in long full-auto bursts. Some of our customers who own the 9mm guns liken the full-auto performance to a laser beam.

Customizable

The quick-change barrel system allows for a large variety of shroud and barrel options.  By using Picatinny rails (MIL-STD-1913) for sights and hand guards, shooters can add a variety of accessories and optics.   The configurations with the Adjustable Bolt System use common AR pattern stocks and grips with hundreds of options currently available. 

Easy-to-Replace Parts

There’s nothing on these guns that can’t be easily replaced.  We designed this system to protect the registered receiver from any wear during use.  The only parts that can wear can be easily replaced without the need to ship the gun back and forth.

Available Service

If you need service, we are here to support our products.

Shoot Cheap Ammo

We typically just shoot steel-cased ammo. Our milled steel trunions easily deal with potential wear issues from any type of ammo.

Can't Get Too Hot

These are ideal for machine-gun shoots. The low-pressure pistol ammo cannot create enough heat in the barrel to cause a malfunction or damage the gun.  There's no gas system to clog, and the open-bolt system negates any cook-off risk.

Options: (Chart)

• U9 Lower Housing (no charge) or STG34 Lower Housing (+350).  The STG34 lower assembly will not fit in the current custom hard case in the package.  Case foam cutouts for the STG34 setups will be available in Feb 2025.  We can send the case when the top foam cutouts are in or we can deduct $500 from the package price.
• Remove suppressor and barrel adapters (-$500)
• Hook or Round Charging Handle (no charge)
• Aluminum Shroud in NiB or Steel Shroud  (blued or parkerized finishes available) (no charge)
• U45 Mag Housing: Composite Plastic (-$300) or Aluminum(no charge)
• U9 Mag Housing: Steel or Aluminum (anodized) or Aluminum (NiB) (no charge)
• Switch to Law Tactical Folding Stock Setup: + $190  

Common Add-Ons (Discounts Available with Gun Purchase):

• Add 12.875" Heavy Barrel (not threaded)
• Add MG08 Pattern Spade Grip Kit: (only works with the standard U9 Lower Housing, not the STG34)
• Add extra bolt 9mm
• Add extra bolt 45 acp
• Add extra barrel with 3-lug adapter
• Add extra barrel 45 barrel threaded 5/8”-24
• Add extra 9mm barrel threaded .578”-28
• Add extra mainspring
• Add RF-0 fast fire buffer assembly (for use with 9mm only) with ACE folding stock system
• Add short Steel Shroud (blued or parkerized finishes available)  shroud setup with 8.6" barrel threaded 1/2"-28 or unthreaded 8.3” barrel

----------------------- 

Product Update Notes:  

2022: We introduced the new Internally Threaded Pattern (ITP) assemblies of the Stemple 76/45 receivers to offer a more streamlined and versatile system with enhanced compatibility among setups.  Per this previously approved method of attaching the trunion, separate trunions and bolt guides are no longer necessary for converting between the standard and heavy bolt systems. While these can still be used on the receiver, one trunion now does it all.  For example, the previous U9 conversion to the U9 slow fire setup required separate trunions/bolt guides, bolts, stocks, and buffers.  In the ITP setup only the stock and buffer assemblies are switched to add mass to the moving parts for lower cycle rates.  The bolt and trunion are unchanged.  The fire controls, stocks, and mag housings are also unchanged.  

The conversion from the U9SF to the U45 in the combination guns is also further simplified by having a much heavier 45 bolt so a second bolt extension is no longer necessary to reduce the cycle rate.

The STG1928 parts are also fully compatible with this setup. 

(See Product & Setup Chart)

2023: We switched to NIB-X® Nickel Boron Technology plating by WMD Guns (dark gray color) on the lower assembly, magazine housing, and barrel jacket. This high performance finish adds greater durability and ease-of-cleaning compared to the black anodized finish commonly used on most guns like USGI M16s. Also, the we made the aluminum parts used in these guns from the best 7075 alloy on the market rather the weaker 6061 alloy commonly used on many gun parts.