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Single barrel shotgun lock mechanism
Weaponeer Forums : Blueprints and Drawings

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  messmen

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Posted: January 04 2017 at 4:45pm | IP Logged Quote messmen

Hello to everyone. Im planing to build a single bore shotgun, and I will primary use this manual for that purpose...

http://mesprojets.eu/Practical%20Scrap%20Metal%20Small%20Arm s%20Vol.14%20%20Break-barrel%20Shotgun%20Plans.pdf


It seams to me thats a good manual, simple to build, and efective.

2 things im going to change, and those are

1. Barrel. It will have 5 to 7 inch reinforcement pipe on top of 3/4 pipe.

2. It must have a locking mechanism.


The other thing is giving me trouble, thats why I am here.


So folks, whats best way to make locking mechanism on this sort of shotgun. It must be simple to build, and highly efective...so when the gun is loaded that there is no chanse it fires....without first pushing that lock-unlock button.

Any ideas?

P.S. I tryed googling...buth i only found plans of factory made shotguns....and their firing mechanism(hamer,triger,lock) is in most cases to complicatet for a homemade built.


Thanks.
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  backbencher

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Posted: January 04 2017 at 9:36pm | IP Logged Quote backbencher

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  messmen

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Posted: January 05 2017 at 7:13am | IP Logged Quote messmen

Oh sorry, Im new here and did not managet to get link working.

Thanks
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  Paraquat

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Posted: January 05 2017 at 8:08am | IP Logged Quote Paraquat

So you want a safety?

How about a dowel with half the diameter knocked out in the middle. Physical denial. I like those best. Simple and go back to my Red Ryder.
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  messmen

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Posted: January 05 2017 at 8:30am | IP Logged Quote messmen

Sorry, I did not quite understood you. My english is not so good, especialy in weaponary terms...

If whats you was saying is to drill a hole trought hammer and gun baseplate...and then inserting a pin trought that...like showh here on quick paint image:


https://s30.postimg.org/y1x9db941/Untitled.png
Well...I was thinking abouth that solution. Its good safety, buth to me it looks ugly and awkwardly....I would much more like to make it button like lock like factory produced shotguns have...like this:

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  messmen

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Posted: January 09 2017 at 4:24pm | IP Logged Quote messmen

No ideas?
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  backbencher

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Posted: January 10 2017 at 10:49am | IP Logged Quote backbencher

You'll have to go to a lot of trouble to install a tang safety.
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  messmen

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Posted: January 11 2017 at 1:57pm | IP Logged Quote messmen

So what do you propose instead?


P,S,


This one is also realy nice trigger mechanism:

https://www.youtube.com/watch?v=DcBjwUBMmBw

Only problem is i dont understand a word whats that dude talking, and I could nowhere find a printable drawings for that build(what i would like to find)

its 3 part trigger mechanism, looks more complicated buth also more safe than that 2 parts parabellum mechanism....buth still has no safety lock

https://www.youtube.com/watch?v=DcBjwUBMmBw
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  backbencher

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Posted: January 12 2017 at 4:27pm | IP Logged Quote backbencher



What Paraquat suggested, I think, was a simple crossbolt safety as is commonly found on hunting firearms.  Very easy to block the trigger with one.
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  messmen

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Posted: January 14 2017 at 4:14am | IP Logged Quote messmen

Can you please reupload that video again, or make a simple paint drawing, how should that be done...i did not understand how should I do it(my english is bad...and google translate is drunk sometimes )
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  backbencher

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Posted: January 14 2017 at 11:57am | IP Logged Quote backbencher

Dude, you're the one who posted the link to that video.  I just made it viewable in the same window - then whoever posted it took it down.
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  messmen

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Posted: January 14 2017 at 12:23pm | IP Logged Quote messmen

Oh...thats strange

It was some brasilian or hispanic dude showing his shotgun. Realy nice solution, buth still it had no locking mechanism.

Can you find some image with that crossbolt safety you talking about?
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  backbencher

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Posted: January 14 2017 at 11:52pm | IP Logged Quote backbencher

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  messmen

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Posted: January 16 2017 at 5:53am | IP Logged Quote messmen

So...whats better way to do it, regarding to this prof. Parrabelum shotgun?
To put pin on trigger, or on hammer?
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  backbencher

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Posted: January 16 2017 at 11:49am | IP Logged Quote backbencher

Absolute best is to lock the firing pin - then it can be drop safe.  2nd best is to lock the hammer, 3rd is lock the trigger.
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  messmen

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Posted: January 16 2017 at 5:52pm | IP Logged Quote messmen

Seams to be impossible to me, to make that firingpin locked in household tools conditions. Parabelum firing pin is made in peace of 1 inch steel bar. Pin hole alone will be hard to precisly drill in home garage, and i dont see a solution how that could be done wit home tools. Solution could be maybe simple (all good solutions are simple and efective) buth, curently i cant see how that could be done with household tools.
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  backbencher

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Posted: January 16 2017 at 10:04pm | IP Logged Quote backbencher

So block the hammer.  Many, many firearms just block the trigger w/ the simple crossbolt.  They're not drop safe - but generally they have to be dropped on the muzzle on a hard surface to discharge.
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  messmen

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Posted: January 17 2017 at 11:43am | IP Logged Quote messmen

Making a firing pin part of the hammer, and then baking a crosbolt safety mechanism on the hamer, would eventuy mada a gun dropp safe. Thing is...gun design would need to be changed and...breach plate would be different.
Safer...buth i dont like the idea of pinn in hammer design. Thats ok for a revolver, not for shotgun
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  messmen

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Posted: January 27 2017 at 11:34am | IP Logged Quote messmen

Well hello again. Wass bussy those days so had no time to replay.

Problem with Push in-out crossbolt safety on parabelum shotgun is next: There is no space inside. Shotgun body is made of 1/4 inch plates, and inside is 1/4 triger group mechanism. No free space. So as shown down on picure 1...when you push bol(green) to fire position...pin gap(red) will fall in shotgun body crossbolt hole...bad solution.

Only thing is to make a lever action rotating crossbolt safety as shown on picture 2 and 3 Pushing the lever up will make a hole on bolt turn to hammer so hammer can move. Pushing it down to S safe wil block the hammer.


Thats only solution i can think of...Only problem is...How to make That crosbolt handle(dark blue) to stay in its place when its on S(safe) and F(fire position)

So what do you supposo folks?




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  Paraquat

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Posted: January 27 2017 at 1:04pm | IP Logged Quote Paraquat

Yea. That's what I suggested.
For making it stay stationary, I'd put a slight bend in the plate to create spring tension OR weld a little snot in the center and use a punch to create two detents in the receiver to lock it in either safe or fire (similar to an AK selector).
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