STEN MK III Parts Kit
STEN Mk III
|STEN Mk III Parts Kit|
|1||Bolt||14||Sling swivel (front)|
|4||Recoil spring cup||17||Trigger|
|5||Rear receiver cap||18||Trigger pin|
|6||Barrel Trunnion (rear)||19||Disconnector|
|7||Hand guard (sitting on top of trunnion in picture)||20||Sear|
|(prevents support hand from going over ejection port)|
|9||Barrel Trunnion (front)||22||Trigger return spring|
|10||Trigger housing||23||Disconnector spring|
|11||Trigger housing cover||24||Extractor|
|12||Magwell (mag button, spring, and ejector)||25||Extractor spring|
|13||Magazine loader (box type) Did not come with kit||26||Extractor pin|
Close up of the trigger housing, I wanted a parts kit with intact trigger housing tabs, to keep the original look of a STEN Mk III when the carbine is complete. In a lot of kits the tabs were cut off during the demilling process. My parts kit was demilled with a torch. The person demilling the kit was careful in preserving the trigger housing & the tabs.
Some other examples of kits demilled with a torch that left the trigger housing & tabs intact.
A example of a good demilled kit with a saw. The tabs are intact, the vertical cut near the rear site does not go into the trigger housing, and the mag well is still attached to the front receiver section.
Some other issues that I have seen is with some of the parts kits that were demilled with cutoff saws. The saw blade cutting into the trigger housing.
So, if your buying a STEN parts kit online and if you care about having an intact trigger housing. Make sure pictures are provided so that you can see if there were any damages done to the trigger housing, tabs, and magwell during the demilling process.
If the pictures aren't clear (website, gun auction, 4 sale forums) ask the seller/site politely if they can provide better pictures of the areas that you may be concerned about. When I purchased my parts kit on www.Gunbroker.com, I asked several sellers for pictures and they were all willing to obliged and provide me with more/clearer pictures to make my decision all that easier.
Comparing the STEN Mk III SMG bolt (top) with the IO semi-auto bolt & striker (bottom). This is the right side of the bolts (extractor side). The original STEN extractor & firing pin are already installed into the IO semi-auto bolt. Please notice the different location for the charging handle. It has been relocated for the semi auto bolt. The overall diameter of the SMG bolt is larger than the semi-auto bolt.
So in a reduced diameter semi-auto STEN receiver the full-auto STEN SMG bolt will not fit inside (it would be too large), nor would the charging handle slot would line up correctly with the charging handle.
This is the left side of the IO semi-auto bolt (top) & STEN Mk III SMG bolt (bottom). The grooves cut into the bolts are clearance cuts (top & bottom) for the magazine feed lips and the middle groove for the ejector. The hole with the roll pin in the IO semi-auto bolt is the firing pin roll pin, it secures the AR-15 firing pin and spring to the bolt.
Just a couple of pictures of the bolt face for the STEN SMG bolt (left) with the fixed firing pin and the IO semi-auto bolt (right).
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This site was last updated 06/20/09