MP28 Sten build Part 1

Custom builds, MP28, Sub Machine-guns, Weapons, WWI, WWII

Taking a different approach to an MP28 build here! Going to be brief and to the point.

Roughing out the stock: The overall shape is cut with a bandsaw using a template. I then take the corners off with a router where applicable. The timber I am using here is Walnut, a beautiful piece I acquired from a furniture maker’s near York.
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I then cut out a recess for the catch and receiver, this is partway through cutting.

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I can then remove materiel from the bottom where the trigger guard will protrude.

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To get a really close fit between the metal and wooden components, I smeared a very thin layer of boot polish over the surfaces of the metal to be mated. This leaves an impression on the high points (or accents as some people call them) that can then be removed tiny bit by tiny bit with a sharp chisel or small file. Using this technique and going slooooowly you can get a very close fit as demonstrated below:

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And with the receiver in position on its initial fitting. I have since adjusted the positioning slightly so it is a bit lower in the stock.

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So, confession time: this is how that Sten receiver fits into that shaped stock. I took an angle grinder to the trigger mechanism housing and removed all the metal below the top of the trigger guard.

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I could then weld on a flat plate of my own to seal the unit in. One of the really good things about the ASG Sten is that it is largely steel, not monkey metal like most airsoft guns! This means it is very easy to work with and I can MIG weld bits together as needed.

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Now, 40mm mild steel tube is damned hard to find. As a result I ended up buying a piece of 42.4mm OD tube with a 4mm wall and turning it down on the lathe. The original tube is on the right, the turned piece is mounted on the lathe.

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I could then mark out and punch where the holes needed to be:

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Before drilling them out.

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The front end of the Sten’s hop-up housing was then turned down to fit snugly inside the heat guard. You could also bore out the inside of the heat guard and leave this unaltered but life is short and this is easier!

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Fitted in place. Worryingly I quite like the look of it in the white, in fact this whole gun looks good with bright steel parts!

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I brazed on the foresight for two reasons: 1. my welder has broken down and is out for repair. 2. It produced a really neat little joint that looked right.

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I could then heat up the entire piece with the propane torch until bright red, the end nearest the camera was topped up with a MAPP torch to get it to temperature.

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I’ll attach a video as well, I thought this looked pretty cool! You will also see in the vid how I rolled the piece over several times to get even heat distribution, which is vital to an even finish.

Dipping this large part in oil, I decided to take a prolonged lunch break and avoid the cancer.

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I allow parts to cool off in the oil pretty much, then allow them to drip as much excess as possible back into the trough, sometimes reheating slightly to ensure maximum removal. I can then rub the piece down with a rag to show the finish. I’m pretty pleased!

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I can then fit the endcap and outer barrel unit, which is one brazed piece.

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And dry fit it to the gun to see the effect!

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Again, because of the broken welder, I brazed the rest of the magwell (the top and sides having been welded earlier). I used a piece of steel tube as the magwell band.

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And in place on the gun, the receiver is also polished ready to be re-finished.

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The rear sight base mounted in place.

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Due to the shape of the magwell, it is necessary to have a bit of an extension to the feed tube in place so that it can open the magazine. I turned this on the lathe in nylon, which should be resilient but not harsh on the magazines that will have to be pushed up against it time and again.

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During disassembly, this extension will have to be removed to remove the mag well. It is easily replaced with a pair of long nosed pliers and a finger.

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Everything oil blacked:_DSF6667

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And fitted into the stock, which still requires finishing. I want to get the fire select working before I finish the stock.

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Some of you follow the Facebook page, and you will have seen pictures of random bits of odd-looking wiring. Those are being used for this: the select fire system. Unfortunately, whoever produced the ASG Sten decided not to use a gearbox with a select fire mechanism built in, so I am having to mess about with a MOSFET in order to make this select fire.

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Having played about with the setup in this configuration, I can make the gun safe and fire in automatic. Just not in semi! Back to the drawing board, but I think I know what needs doing.

More next time!

If this post has inspired you to want a gun of your own, do drop us a line on enquiries.vintageairsoft@gmail.com to discuss or find us on Facebook to look at more related content.

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