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STEN MK3

STEN Mk3 with vented receiver

Semi Auto STEN MK3 built with Vented receiver



STEN Mk3 plain Tube

Item # MK3SAPT
Price $80
Weight 2 lb

New and improved design! Semiautomatic partially machined receiver tube "PLAIN STYLE" for the STEN MK3. New design allows you to use the hook safety like the originals. We have six styles of MK3 tubes available. This tube is plain which means that it has no venting holes around the barrel shroud or a sight rail. All of our MK3 tubes have the same functional dimensions. This is made from high quality American 4130 DOM tubing and designed to work with our conversion kit. When finished, this tube will not accept a fully automatic bolt. The high quality template is CAD drawn and is glued to the aerospace grade 4130 DOM receiver tube. The front of the tube is bored out to accept the original front barrel bushing. The back of the tube is bored out to accept the original spring cup and retaining ring. You will need a dremmel tool or milling machine and a welder to assemble. This design has been classified by the ATF as a firearm and not a machinegun.



STEN Mk3 tube with sight rail STEN Mk3 sight rail detail

Item # MK3SAOT
Price $130
Weight 2 lb

New and improved design! Semiautomatic partially machined receiver tube "ORIGINAL STYLE" for the STEN MK3. New design allows you to use the hook safety like the originals. We have six styles of MK3 tubes available. This tube is original which means that it has the full length sight rail. All of our MK3 tubes have the same functional dimensions. This has the FULL LENGTH sight rail, is made from high quality American 4130 DOM tubing, and is designed to work with our conversion kit. When finished, this tube will not accept a fully automatic bolt. The high quality template is CAD drawn and is glued to the aerospace grade 4130 DOM receiver tube. The front of the tube is bored out to accept the original front barrel bushing. The back of the tube is bored out to accept the original spring cup and retaining ring. You will need a dremmel tool or milling machine and a welder to assemble. This design has been classified by the ATF as a firearm and not a machinegun.



STEN Mk3 vented tube STEN Mk3 vented tube detail

Item # MK3SAVT
Price $120
Weight 2 lb

New and improved design! Semiautomatic partially machined receiver tube "VENTED STYLE" for the STEN MK3. New design allows you to use the hook safety like the originals. We have six styles of MK3 tubes available. This tube is vented one which means that it has a 52 hole pattern drilled around the barrel shroud. All of our MK3 tubes have the same functional dimensions. This is made from high quality American 4130 DOM tubing and designed to work with our conversion kit. When finished, this tube will not accept a fully automatic bolt. The high quality template is CAD drawn and is glued to the aerospace grade 4130 DOM receiver tube. The front of the tube is bored out to accept the original front barrel bushing. The back of the tube is bored out to accept the original spring cup and retaining ring. You will need a dremmel tool or milling machine and a welder to assemble. This design has been classified by the ATF as a firearm and not a machinegun.



STEN Mk3 vertical plain tube

Item # MK3VSAPT
Price $80
Weight 2 lb

New and improved design! Semiautomatic vertical magazine feed partially machined receiver tube "PLAIN STYLE" for the STEN MK3. This new design allows you to use the hook safety like the originals. We have six styles of MK3 tubes available. This tube has the magazine port located so that the magazine will be in the vertical position which is similar to the MP-40. This tube is plain which means that it has no venting holes around the barrel shroud or a sight rail. All of our MK3 tubes have the same functional dimensions. This is made from high quality American 4130 DOM tubing and designed to work with our MK3 vertical bolt conversion kit. When finished, this tube will not accept a fully automatic bolt. The high quality template is CAD drawn and includes critical dimensions and assembly tips. The front of the tube is bored out to accept the original front barrel bushing. The back of the tube is bored out to accept the original spring cup and retaining ring. You will need a dremmel tool or milling machine and a welder to assemble. This design has been classified by the ATF as a firearm and not a machinegun.



STEN Mk3 vertical tube with sight rail STEN Mk3 sight rail detail

Item # MK3VSAOT
Price $130
Weight 2 lb

New and improved design! Semiautomatic vertical magazine feed partially machined receiver tube "ORIGINAL STYLE" for the STEN MK3. This new design allows you to use the hook safety like the originals. We have six styles of MK3 tubes available. This tube has the magazine port located so that the magazine will be in the vertical position which is similar to the MP-40. This tube is "original" which means that it has the full length sight rail, 5 venting holes, letter stamp on the front, and holes in the sight rail just like the original ones do. The sight rail is straight and firmly welded into position so it will not break off. All of our MK3 tubes have the same functional dimensions. This is made from high quality American 4130 DOM tubing and designed to work with our MK3 vertical bolt conversion kit. When finished, this tube will not accept a fully automatic bolt. The high quality template is CAD drawn and includes critical dimensions and assembly tips. The front of the tube is bored out to accept the original front barrel bushing. The back of the tube is bored out to accept the original spring cup and retaining ring. You will need a dremmel tool or milling machine and a welder to assemble. This design has been classified by the ATF as a firearm and not a machinegun.



STEN Mk3 vertical vented tube STEN Mk3 vented tube detail

Item # MK3VSAVT
Price $120
Weight 2 lb

New and improved design! Semiautomatic vertical magazine feed partially machined receiver tube "VENTED STYLE" for the STEN MK3. This new design allows you to use the hook safety like the originals. We have six styles of MK3 tubes available. This tube has the magazine port located so that the magazine will be in the vertical position which is similar to the MP-40. This tube is vented which means that it has a 52 hole pattern drilled around the barrel shroud. The holes are drilled before the template is put on. All of our MK3 tubes have the same functional dimensions. This is made from high quality American 4130 DOM tubing and designed to work with our MK3 vertical bolt conversion kit. When finished, this tube will not accept a fully automatic bolt. The high quality template is CAD drawn and includes critical dimensions and assembly tips. The front of the tube is bored out to accept the original front barrel bushing. The back of the tube is bored out to accept the original spring cup and retaining ring. You will need a dremmel tool or milling machine and a welder to assemble. This design has been classified by the ATF as a firearm and not a machinegun.



STEN Mk3 Build Kit STEN Bolt

Item # MK3SAK
Price $285
Weight 2 lb

New and improved design! Semiautomatic build kit for the STEN MK3. This closed bolt system works extremely well and eliminates the problems of kits offered by other companies. You will need this kit, one of our partially machined receiver tubes, and an original MK3 parts kit in order to build a legal semi automatic firearm. This kit includes the following high quality American made parts: a semi-auto bolt, cocking handle, standard AR-15 firing pin, roll pin, firing pin spring, bolt stop, guide rods, rod retainer, 2 sets of springs, barrel extension, rear barrel bushing, rivets, and assembly instructions. Two small parts need welding. The barrel extension is a non-rifled tube that is slipped over and welded to the existing barrel. It is not included if you order a 16" barrel at the same time. Design is based on our ATF approved MK3 model. Other US made parts may be needed to be compliant with GCA 18 U.S.C. 922r.



STEN Mk3 Build Kit STEN Mk3 Vertical Bolt

Item # MK3VSAK
Price $285
Weight 2 lb

New and improved design! Semiautomatic vertical feed build kit for the STEN MK3. The bolt in this kit is machined to allow feeding from a vertically mounted magazine housing similar to the MP-40 and the MP-3008. This is not a modified standard semi auto bolt but a specially machined bolt. This closed bolt system works extremely well and eliminates the problems of kits offered by other companies. You will need this kit, one of our partially machined MK3 vertical feed receiver tubes, and an original MK3 parts kit in order to build a legal semi automatic firearm. This kit includes the following high quality American-made parts; a semi-auto bolt, cocking handle, standard AR-15 firing pin, roll pin, firing pin spring, bolt stop, guide rods, rear barrel bushing (reduced diameter), rod retainer, hammer, recoil springs, barrel extension, and assembly instructions. Two small parts need to be welded together. The barrel extension is a non-rifled tube that is slipped over and welded to the existing barrel. It is not included if you order a 16" barrel at the same time. This design has been classified by the ATF as a firearm and not a machinegun. 922r compliant.



STEN Mk3 barrel

Item # MK3-9B16
Price $110
Weight 1 lb 10 oz

16" barrel for the STEN MK3. These barrels are made from high quality steel and have a 10 groove right hand twist. We make these barrels thicker than the originals, which are very thin at the end. The front barrel bushing will have to be drilled out to 5/8". Chambered and ready to install.



STEN Mk3 barrel

Item # MK3-9B8
Price $85
Weight 10 oz

This is a new 8" STEN MK3 9mm barrel. The barrel has a 10 groove right hand twist with an excellent bore. Chambered and in the white. This is a GCA 18 U.S.C. 922r compliant part.



STEN Mk3 barrel

Item # MK3-7.62B16
Price $140
Weight 1 lb 10 oz

New 16" STEN MK3 barrel made in 7.62 x 25 TOK. The barrel is made from 4140 tool steel and is button rifled. Chambered and in the white. A standard STEN magazine can be modified to accept this cartridge. No modifications to the magazine well are needed. This is a GCA 18 U.S.C. 922r compliant part.



STEN Mk3 7.62x25 barrel

Item # MK3-7.62B8
Price $80
Weight 10 oz

This is a new 8" STEN MK3 barrel made in 7.62 x 25 TOK. The barrel is made from 4140 tool steel and is button rifled. Chambered and in the white. A standard STEN magazine can be modified to accept this cartridge. No modifications to the magazine well are needed. This is a GCA 18 U.S.C. 922r compliant part.



STEN Mk3 barrel bushings

Item # MK3BSET
Price $55
Weight 6 oz

This is a set of new barrel bushings for an original diameter STEN MK3. The outside diameter is 1 3/8" and they will work with an original barrel. These are precision CNC machined and are made from grade 4140 tool steel.



STEN Mk3 rear barrel bushing

Item # MK3RB
Price $30
Weight 3 oz

This is a new rear barrel bushing for an original diameter STEN MK3. The outside diameter is 1 3/8" and will work with an original barrel or our 16" barrel. They will not fit in our semi auto tubes. Precision machined from 4140 tool steel.



STEN Mk3 front barrel bushing

Item # MK3FB
Price $30
Weight 3 oz

This is a new front barrel bushing for an original diameter STEN MK3. The outside diameter is 1 3/8" and will work with an original barrel. They will also work in our semi auto tubes. If using one of our 16" barrels, the hole will need to be opened up to 5/8". Precision machined from 4140 tool steel.



STEN Mk3 Magazine Housing

Item # MK3MH
Price $95
Weight 8 oz

This is a brand new magazine housing for the STEN MK3. They are beautifully crafted to exact tolerances for consistent fit and function. These are made better than the originals and contain heat treated components for a long life. These housings are made in the USA and are 922r compliant.



Magazine Housing Conversion Kit

Item # MHCKIT
Price $70
Weight 7 oz

This kit will allow you to convert your STEN MK3 magazine housing into a STEN MK2 or MK5 housing. Kit comes with full instructions and necessary hardware (shown in picture). Other parts are needed to convert an entire MK3 parts kit to a MK2 or MK5. A great item for those wanting a hard to find MK2 parts kit. Some cutting and welding required for assembly.



STEN Disconnector

Item #STENDIS
Price $15
Weight 1 oz

This is a new US made STEN disconnector that will work with the STEN MK2, MK3, or MK5. Heat treated and higher quality than the original part. It is a r922 compliant part.




STEN Extractor

Item # STENEX
Price $30
Weight 1 oz

Extractor for the MK2 and MK3 Sten. This is a new Sten extractor and is an exact copy of an original. Made from quality American steel and hardened.




STEN Mk3 Rivets STEN Mk3 Rivet

Item # MK3RIVETS
Price $7
Weight 1 oz

Set of 12 rivets for the STEN MK3. These are special splined drive rivets that are easier to install than traditional press fit rivets.




STEN Trigger Return Spring

Item #STENTRS
Price $8
Weight 1 oz

STEN trigger return spring NEW. Will fit the MK2, MK3, and MK5.




STEN Sear Pin

Item #STENSP
Price $10
Weight 1 oz
Backordered

This is a new sear pin for the STEN MK2,MK3, or MK5. Made from hardened tool steel.




Springs

Item #SPRINGS
Price $8
Weight 1 oz

A set of recoil and hammer springs.


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