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Item # MK3SAPT
Price $80
Weight 2 lb
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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.
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Item # MK3SAOT
Price $130
Weight 2 lb
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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.
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Item # MK3SAVT
Price $120
Weight 2 lb
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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.
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Item # MK3VSAPT
Price $80
Weight 2 lb
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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.
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Item # MK3VSAOT
Price $130
Weight 2 lb
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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.
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Item # MK3VSAVT
Price $120
Weight 2 lb
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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.
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Item # MK3SAK
Price $285
Weight 2 lb
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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.
Due to current supply issues, our semi auto kits may not include the firing pin. If so, the
price will be reduced to compensate for the missing part. The bolts use a standard AR-15 firing pin.
There are two typical sizes of collars on them and our bolts use the ones with the smaller collar of .340”.
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Item # MK3VSAK
Price $285
Weight 2 lb
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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.
Due to current supply issues, our semi auto kits may not include the firing pin. If so, the
price will be reduced to compensate for the missing part. The bolts use a standard AR-15 firing pin.
There are two typical sizes of collars on them and our bolts use the ones with the smaller collar of .340”.
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Item # MK3-9B16
Price $105
Weight 1 lb 10 oz
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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.
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Item # MK3-9B8
Price $75
Weight 10 oz
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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.
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Item # MK3-7.62B16
Price $140
Weight 1 lb 10 oz
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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.
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Item # MK3-7.62B8
Price $80
Weight 10 oz
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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.
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Item # MK3MH
Price $95
Weight 8 oz
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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.
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Item # MHCKIT
Price $70
Weight 7 oz
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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.
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Item # STENEX
Price $30
Weight 1 oz
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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.
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Item # MK3RIVETS
Price $7
Weight 1 oz
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Set of 12 rivets for the STEN MK3. These are special splined drive rivets that are easier to
install than traditional press fit rivets.
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Item #STENTRS
Price $8
Weight 1 oz
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STEN trigger return spring NEW. Will fit the MK2, MK3, and MK5.
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Item #SPRINGS
Price $8
Weight 1 oz
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A set of recoil and hammer springs.
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