Win Mod12 Trench Gun Conversion

[Madcap]

It should be tapered (narrower towards the muzzle end). Only the Model 12 trench gun barrels have no taper.

Had me cornfused there. OK, so original M12 Trench doesn't taper toward the end of the barrel. With this gun and Riot conversions the barrel does taper so it would requiring a sleeve if an original adapter is used.
Excellent - thank you!

Information

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[Madcap]

Hello -

My apology for any apparent lack of follow up on this project. A few interruptions and various priorities took precedence. Anyway, I think the answer to the original heat shield attachment question was recently solved. A good friend with years of experience in the engineering and mechanics profession revealed that silver soldering the rivets was probably the answer. That sounds like the most logical and simple solution.

So, the next step is to clean up the matching holes, trim the length of the rivets and solder the buggers in. The entire shield and bayonet attachment will be blued - not sure if I'll cold blue myself or have it professionally rust-blued. Meantime the bottom of the barrel needs the grooves added also.

Results of each process should be within the next couple weeks.

Hope all is well with you guys,

Dick

[Madcap]

Photos of the rivets installed but not soldered yet. The one misaligned hole will be filled in. Interior shot shows the rivets needing to be trimmed prior to soldering.

[rcathey]

I’ve been using a laser cutting service for some projects at work recently.
If you could get a CAD file drawn up using the stub of the heat shield you have, you could at least get a quote for having a flat cut.
You’d need to find a way to bend it round though.

I could do the CAD file for you but I’d need the heat shield in hand.

Anyway, the cutting service is Online Laser and CNC cutting for metals and plastics - Instant Quotes

[Madcap]

I’ve been using a laser cutting service for some projects at work recently.
If you could get a CAD file drawn up using the stub of the heat shield you have, you could at least get a quote for having a flat cut.
You’d need to find a way to bend it round though.

I could do the CAD file for you but I’d need the heat shield in hand.

Anyway, the cutting service is Online Laser and CNC cutting for metals and plastics - Instant Quotes

That sounds very encouraging. I don't have a way I know of to manage doing a CAD file though.... I'm pretty low tech and not too smart in that area. I could send the stub I guess if you think you could make a compete pattern but I don't understand how a full length pattern could be made from the incomplete, short stub to include the wider, flared rear portion. If I make myself clear....but Let me know what you think, I appreciate it.

[rcathey]

how a full length pattern could be made from the incomplete, short stub to include the wider, flared rear portion.

I think I could get that detail from scaling off pictures on the internet.
When I get back to the office tomorrow I’ll do a mock sketch to get an idea on price.
Just the approximate amount of holes, length, etc. That would at least tell us if it’s worth proceeding with a real drawing

If you could tell me the metal thickness and the diameter of the holes, that would be enough to start.

[Madcap]

I think I could get that detail from scaling off pictures on the internet.
When I get back to the office tomorrow I’ll do a mock sketch to get an idea on price.
Just the approximate amount of holes, length, etc. That would at least tell us if it’s worth proceeding with a real drawing

If you could tell me the metal thickness and the diameter of the holes, that would be enough to start.

That's very considerate. I have to be away this afternoon but will try to measure the metal thickness and diameter of the holes ASAP.

[Madcap]

I think I could get that detail from scaling off pictures on the internet.
When I get back to the office tomorrow I’ll do a mock sketch to get an idea on price.
Just the approximate amount of holes, length, etc. That would at least tell us if it’s worth proceeding with a real drawing

If you could tell me the metal thickness and the diameter of the holes, that would be enough to start.

OK, sorry for the delay. I'm not a machinist and not sure these numbers are correct but this is what I came up with:
Hole Dia = .234 / 15/64"
Metal stock thickness = 0.02"

I'm also going to try asking someone with an actual adapter if they'd be willing to take measurements also.

Thanks for your help and interest -
Dick

edit: 15/64 (not 15/16) geez

[rcathey]

Unfortunately, the only steel they have that thin is mild steel -- and even then, it's .03" thick, not .02"

That said, based on my rough sketch (2.5" wide, 12.5" long, with 76 evenly spaced .234" holes), the price would be about $12.

Crappy steel that's the wrong thickness but pretty cheap as a stop-gap if needed!

[baltimoreed]

If there is 20 inches of barrel I would cut it there and install a mount. Also I don’t think the pump handle is correct for a riot gun. Go on over to the machinegunboards forum and scroll down to the shotgun subforum. There are some sg experts over there too.