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Falling block WARNING Gratuitous MS Paint
Weaponeer Forums : Blueprints and Drawings

Posted in Blueprints and Drawings
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  Bando_red

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Posted: December 28 2017 at 9:10pm | IP Logged Quote Bando_red

I've lost this after I completely typed it twice already so I'm going to make this short and sweet this time cuz I'm getting frustrated lol.

Made this in paint. It's terrible but it gets the idea across I think. Working on sketches and blueprints.  Idea is a single shot derringer.
Notable features are the grip safety, lack of spur or trigger guard and falling block action which I've never seen used on a derringer (probably with good reason)

Ideally I'd like to chamber it in .40 S&W & 9mm and also .50 GI just for sh*ts and gigs. starting it as an inline muzzleloader to get it off the ground faster but the idea is that it can swap barrels.

My main hurdles at this point will be determining proportions and measurements which will be dictated largely by materials as I will be limited to hand tools other than a power drill and dremel. I'm not sure the "sandwich" steel method is of sufficient strength and admittedly my metallurgy knowledge is minimal at best, but I'm also unsure as to my ability to make a single piece frame with the tools at hand. I also haven't decided how I'm going to lock and unlock the breech block.

input and questions welcome

https://imgur.com/a/PieYh



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  backbencher

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Posted: December 28 2017 at 10:38pm | IP Logged Quote backbencher

Welcome to Weaponeer and the Academy of Dremel Gun Making.  I too am a proud member of both.  Got any Legos?
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  bikergunnut

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Posted: December 28 2017 at 11:22pm | IP Logged Quote bikergunnut

Welcome to Weaponeer.

Look around at 1850-60's handguns for inspiration for your lockup. It was an innovative time with all sorts of neat ideas.

Hollow grip and simple flat spring for the hammer covered with wood grips have been used over a hundred years. You could bend a piece of flat steel for the grip and your grip safety could block the spring or the hammer.

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  Zuzzy

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Posted: December 29 2017 at 8:02am | IP Logged Quote Zuzzy

Using paint is just like file and hacksaw gunsmithing - in other words, it is very welcomed here, and it has its charm.
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  Bando_red

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Posted: January 03 2018 at 1:25am | IP Logged Quote Bando_red

I've decided to invest in an arcwelder in the spring to broaden my possibilities. I also redesigned the grip and frame profile. I couldn't find a layout for the different parts of the falling block action that I liked, so I decided to switch to a martini-style tilting block action. The breech block will be a little harder to make but it simplifies the rest of things.


Grip safety is actually going to block the trigger from moving since it can't be fired without the trigger being depressed. Going to cut the grip frame from a piece of plate metal and weld the reciever walls to it for a solid frame. I have a small chunk of california redwood I'm going to source the grips from. I was going to use a coil spring for the frame simply because I have a bunch of em in the random junk drawer and I can just get em from the hardware store for pocket change. I'll have to make a strut but I think I can figure that out
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  Zuzzy

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Posted: January 08 2018 at 1:00pm | IP Logged Quote Zuzzy

Arc welder is better than nothing but it is heavily dependent on the skill and quality, and for thin and precise parts its easily to damage them or ending too ugly of welds.
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  Bando_red

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Posted: January 10 2018 at 11:22pm | IP Logged Quote Bando_red

The only parts I'll be welding will be the frame layers together so it's a one piece frame. Also my brother is a certified welder and my sister is taking it at a trade high school so I'll have a little help

I've altered it substantially since posting. It's more of a lever actuated rolling block/falling block bastard, mainly to cut down on external snaggy bits and internal fiddly delicate bits. I'll post an update when I've clean up the sketch a bit. Only thing I'm not totally positive on is the system to lock the action closed which is just two tabs of metal on the lever that mate with the frame behind the bottom of the breech and behind the trigger. It would be plenty for a .22 or the old civil war breechloader cartridges that I copied the basic idea from but I'm not sure about it holding up to modern pistol cartridges.
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