Delisle Carbine Project

Fargone4sure

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Delisle Carbine Project FINALLY FINISHED

The Delisle carbine was a modified SMLE chambered in 45acp, complete with an integral suppressor, build during WW2.

Like many others, I find the Delisle carbine an interesting and desirable gun. Also like many others, i find that any reproductions of the gun are either not historicaly accurate, or are prohibitively expensive. Most often a combination of both.

The reason for the expense in producing a Delisle carbine is due to the amount of machining/fitting required. I've read that original Delisle required more man hours to build than a Bren gun.

So like a few other intrepid souls before me, I decided not let common sense or fear deter me, and started sourcing the various parts needed to make a reproduction Delisle.

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Picture of a Delisle, hopefully my repro will end up looking like this.

To this point I've disassembled a Sporter SMLE, and removed the barrel.

Next step was to bore out the action, openning it up to .750" wide in order to allow the 45acp barrel to be set back into the action. In the picture below you can see the bright areas, and see how much metal was removed.
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I had purchased a 20" 45acp barrel blank. The picture below shows it after i machined it to size, and threaded it for the SMLE action.
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Heres a picture of the barrel partially threaded into the action.
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Have finished shortening the bolt.. Picture show the shortened bolt along a standard length one. Also shown is the recessed bolt face with the new ejector slot milled in the side. And a picture of the plastic bumper dovetailed into the underside of the bolt handle. This was done on the originals to quite the "clank" of the bolt handle closing.

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Work done to complete the bolt:
- anneal the bolt body and head
- cut off bolt handle to allow bolt body to be held in collet on the lathe
- cut bolt body to length
- drill and tap body for thread on bolt head
- drill deeper spring channel in body
- cut firing pin to appropriate length and thread end
- cut firing pin spring to appropriate length
- plasma weld bolt handle back on
- cut dovetail in underside of bolt handle for plastic bumper
- cut recess in bolt head
- mill an ejector slot in side of head
- re-heat treat and temper bolt body and head
- fit plastic bumper to bolt handle
- lots of filing and fitting, lol.

Due to limits on the number of pictures that can be attached to a post, future pictures of the build will be attached to new posts further in the thread.
 

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I am almost finished my mag well adapter for mine. Push button mag release. It is definitely a time consuming project.

Hey Deitch, just interested in why you decided to go with a push button release versus utilizing the smle mag release? I think I'm going to pick up a small box/pan break from Princess Auto to help with making the mag well adapter.
 
I bought the rifle already converted to .45ACP with an octagon barrel. It wasn't done in the traditional way and the bolt wasn't shortened and the barrel wasn't inset. This has the mag set more forward and the mag catch doesn't reach. I came up with design to fit within the space constraints of the shell of .303 mag cut flush with the receiver. I wasn't happy with the .45 mag welded into a .303 mag it came with. It has turned into a meticulous adventure of brazing and filing. I'll sort out some pictures.
 
The receiver can be mounted on a mandrel, and a collar threaded into the receiver ring. The mandrel is held in the chuck, and the collar supported in the steady rest. The boring bar is then run through the collar and the receiver, to open out the receiver for the barrel.

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The shortened bolt in the receiver.

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This is a dummy barrel installed in the altered receiver.

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Just a suggestion - rather than cut the bolt and then cut the threads, run the tap in deep enough, and then cut the bolt. That way, the threads will be true and concentric. No issues getting the tap started straight in. Probably necessary to anneal the bolt for threading and cutting; bolt head may need to be softened as well before counterboring. If I remember correctly, it was necessary to drill deeper into the bolt to provide enough room for the firing pin spring.
 

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Couple of thoughts...
A version could be made in 9x19, using 9mm 1911 magazines, and 7.62x25 would also be a possibility. Tokarev magazines should work, and a .303 barrel adapted.
 
Hey Tiriaq, the method you mention for boring out the action is the normal route, and no doubt the most precise. But at the time I did mine i didn't have a long enough boring bar. So instead, i used the mandrel to mount the action in a three jaw chuck mounted on my milling machine, and bored it out that way. Saved some time having to make the fake stub barrel, and set up the steady rest. Not as precise as your method because the action is only supported on one end. But the boring doesn't need to be 100% accurate for this purpose, so just another way to skin the cat.

As you mention, lots of different caliber possibilities, but I'm wanting to stay as historically accurate as possible, thus 45acp. An additional advantage is that since we can't have a funtional suppressor, at least 45acp is sub-sonic, and out of a long barrel, reasonably quite.
 
I bought the rifle already converted to .45ACP with an octagon barrel. It wasn't done in the traditional way and the bolt wasn't shortened and the barrel wasn't inset. This has the mag set more forward and the mag catch doesn't reach. I came up with design to fit within the space constraints of the shell of .303 mag cut flush with the receiver. I wasn't happy with the .45 mag welded into a .303 mag it came with. It has turned into a meticulous adventure of brazing and filing. I'll sort out some pictures.

Ok, that makes sense. And yes, no end to fitting, filing, trial and error. Everything about these conversions soaks up time, lol. I was thinking of just welding up the mag well since it is a one off. But then was thinking I'd be farther ahead to use a pan/break to bend as many corners as i can, just to reduce the grinding/filing cleanup.
 
If you want other Lee Enfield projects, consider a Charlton or a Francis Howard. For the latter, have a look at w ww.forgottenweapons.com.
 
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