Interest in blank fire kits for 37mm m3,m3a1,m6?

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tranham
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Interest in blank fire kits for 37mm m3,m3a1,m6?

Post by tranham » Tue Apr 04, 2017 12:02 pm

All

Some of you have one of my 37mm to 25mm blank fire only subcaliber conversions I've sold in years past. I'm thinking of making another run and want to check interest.

What is it? Basically an insert into the chamber the same size as a 37mm but with a 25mm chamber inside it.

How does it work? You insert it into your 37mm cannon chamber. It's held in place with a rubber O ring around the insert. Some force required to install and remove (a couple hits with a wood block). With modified 25mm bushmaster cases you can insert and eject cases as easily as a normal 37mm

What are the benefits? Several. You won't tear up your $50 cases. No more risking of dropping one and bending a 37mm neck. You save a ton of time reloading, no multiple step primer system. Just punch out old, press in new. Unconverted Bushmaster cases are $5-$10. When I go to an event I have 50 plus shells read to fire. The 25mm steel cases are much harder to damage. You can reuse them hundreds of times.


What modifications to gun are required? Nothing to the gun except the firing pin needs to be lathed to a point like a normal firing pin. The bushmaster cases use standard 50 cal primers (after modification)

What modifications to cases are required? Cases get a large washer welded to ends same size as 37mm rim. This allows them to eject correctly from gun. The primer hole gets a bushing pressed in so that it will now accept a 50 cal primer. The insert wil stay in place and not have to be pressed in again during reloads.

How loud? Very loud! I use black powder. Total max load is around 3oz. Plenty enough to rattle windows and hearing protection is highly recommended.

How much? Guessing $400 for the insert. Converting cases and firing pins extra.

tranham
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Re: Interest in blank fire kits for 37mm m3,m3a1,m6?

Post by tranham » Sun Apr 09, 2017 7:56 am

I have 3 people lined up so far, anybody else?

ferdockm
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Re: Interest in blank fire kits for 37mm m3,m3a1,m6?

Post by ferdockm » Wed Jun 28, 2017 9:09 am

Count me in.

Thanks
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Matt Ferdock
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Re: Interest in blank fire kits for 37mm m3,m3a1,m6?

Post by tranham » Wed Aug 16, 2017 8:43 am

FYI. Finally got the first one back from C&C lathe shop. Pics below. Waiting on prices in quantity. Adapters will be parkerized. Also included will be firing pins turned down to fire percussion primers. I'll contact those that PMed me shortly

Robert

https://www.dropbox.com/sh/ff4t8vdzvja2 ... sF2ga?dl=0

tranham
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Re: Interest in blank fire kits for 37mm m3,m3a1,m6?

Post by tranham » Thu Aug 24, 2017 2:19 pm

Ok. Cost of insert if I get 5 people to buy in will be $375. each. Including parkerized finish and o ring. If you want a turned down firing pin (required to fire 50 cal primers) cost is $60. Each round modified to work will be $9 each.

So for basic cost comparison $800 would get you an insert, firing pin and 40 rounds. That's the same cost as 16 full size 37mm cases


ferdockm
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Re: Interest in blank fire kits for 37mm m3,m3a1,m6?

Post by ferdockm » Thu Aug 24, 2017 3:09 pm

The workmanship looks really good.

Thanks
Regards,

Matt Ferdock
(484) 571-9458

Owner of:
1944 Ford G8T 1 1/2 ton
1944 M16 Halftrack
1941 M3A1e5 White Scout Car G67; Ord 1010
1943 M20
1944 M8
M45 Quad 50 x2
75mm AB Howey
37mm AT
105mm Howey
1942 Bantam Trailer x2
1 anxious wife

tranham
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Re: Interest in blank fire kits for 37mm m3,m3a1,m6?

Post by tranham » Fri Aug 25, 2017 1:05 pm


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Re: Interest in blank fire kits for 37mm m3,m3a1,m6?

Post by finhead » Fri Aug 25, 2017 9:07 pm

whats your phone # I am interested also

tranham
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Re: Interest in blank fire kits for 37mm m3,m3a1,m6?

Post by tranham » Sun Aug 27, 2017 10:13 am

PM sent with number

I have 3 sold. Need 2 more sold to maintain the price, otherwise it will be more

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Re: Interest in blank fire kits for 37mm m3,m3a1,m6?

Post by tranham » Wed Aug 30, 2017 11:19 am

4 sold. Just need one more to get this project started.

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Re: Interest in blank fire kits for 37mm m3,m3a1,m6?

Post by tranham » Thu Sep 07, 2017 6:44 pm

FYI I have 5 people committed now. Anyone else that wants to jump in still has a little time. Contact me

Robert

Tranham@hotmail.com

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Re: Interest in blank fire kits for 37mm m3,m3a1,m6?

Post by tranham » Sat Sep 16, 2017 8:23 pm

Barrel inserts are now ordered.

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Re: Interest in blank fire kits for 37mm m3,m3a1,m6?

Post by tranham » Mon Sep 25, 2017 3:20 pm

Lathe shop has inserts ready. Need to parkerize this weekend.

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Re: Interest in blank fire kits for 37mm m3,m3a1,m6?

Post by tranham » Fri Nov 03, 2017 10:13 pm

FYI entire project should be done in 2 weeks. Finally making good progress

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Re: Interest in blank fire kits for 37mm m3,m3a1,m6?

Post by DAVY » Sun Nov 05, 2017 3:21 pm

Can you make one for 105 mm how

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