Mini UZI Semi; what am I missing to complete one?

[cvasqu03]

EDITED FOR CLARITY; I realized my original post was kind of meandering so I've edited to make it a bit clearer what I'm asking.

Hey guys, I’ve been mulling over finally starting on a long-planned project (and I mean LONG). I have several receiver pieces that I wanted to try to weld up into a couple of full size UZI semi receivers, and I wanted to make one into a mini receiver using suka5168’s tutorial from the reference library. Just so you know how long I’ve been planning this, I actually got that mini bolt back when CDNN was selling them. I purchased the other parts here and there over the years and almost have it complete.

The biggest problem I’ve run into is getting that little piece from the striker that the smaller spring goes into. One of the difficulties I've had is that I don’t know what it’s called. I found one parts diagram that called it a striker spring guide and I thought I’d found it on Numrich Gun Parts but what I got appears to be a part from the full size striker. (see second picture)

So I'd like to know what I'm missing here; my questions are as follows:

1. what’s the name of the part of the striker that I’m missing (and does anyone know where I can get one)?
2. I can tell I need a blocking latch for the bolt, but is that part for the mini the same as for a full size bolt?
3. How does that pin and spring that holds the folding stock in place supposed to hold on? I assume it’s some type of C-clip but does anyone know where I can get one?
4. The front/back receiver pieces I have are all Model A, but I want to use Model B sights. Is there any way to convert these to work with Model B sights? I mean, would it just be a matter of drilling the additional holes, or are the dimensions also a bit different? Suka's tutorial mentions having to weld over the front sight portion and drill/tap for the model B sights but didn't show any pictures so I'm not sure how to go about setting it up for the little plunger pin that clicks the FS into place as it rotates.

BTW, yes I did purchase the single right side handguard that Numrich has for sale. I have no idea why they have a supply of just the one side, but as soon as I get my computer rebuilt, I’m going to try to scan it with my 3D scanner and mirror it to see if I can make the other side on my 3d printer (which I've yet to try out).

 

[NorincoKid]

When I did mine I used full size stubs and the mini-specific recoil/striker parts from GMT.

I can measure the recoil "cup/plunger/guide/whatever" that is if it helps. I'm not sure how different they are from full size ones.

 

[cvasqu03]

OK, sorry I have one other question. I do plan to SBR this when I'm done but I'd like to avoid having to buy an 18" barrel in the interim. When I finally get around to welding the receiver, I was hoping to first make it into a pistol so I could get it working with the short barrel, and then add the stock when I get the paperwork approved. My question is about the legality of attaching that backplate with the hinges before getting the SBR paperwork approved. Would it still be considered a pistol if it has that backplate as long as there's no stock attached, or would I have to wait until after I get my paperwork back before I can attach the hinge plate?

 

[cvasqu03]

When I did mine I used full size stubs and the mini-specific recoil/striker parts from GMT.

I can measure the recoil "cup/plunger/guide/whatever" that is if it helps. I'm not sure how different they are from full size ones.

Do you mean you welded a receiver from pieces of a full size receiver? That's what I'd like to do as well. How did you handle the sights? Did you just use Model ! sights, or were the receiver pieces you used set up for model b parts?

 

[slimshady]

As long as you don't have a stock that fits in your possession there are no legal issues with having a mounting point, no way to create an SBR with what you have. Give your stock to a friend with instructions to keep it until you show them an approved form 1.

Is there anything in there you can use? Cheap source of a factory extractor these days and AFAIK the UZI Pro stuff does fit the micro and mini bolts despite what the ad copy says.

UZI Pro Spare Parts Kit - IWI US

UZI Pro spare parts kit includes: Firing Pin Firing Pin Spring Firing Pin Guide Extractor Extractor Pin Blocking Latch Blocking Latch Spring Please Note: The removal and installation of these parts should be completed by a certified gunsmith. Made in Israel

iwi.us

 

[cvasqu03]

As long as you don't have a stock that fits in your possession there are no legal issues with having a mounting point, no way to create an SBR with what you have. Give your stock to a friend with instructions to keep it until you show them an approved form 1.

Is there anything in there you can use? Cheap source of a factory extractor these days and AFAIK the UZI Pro stuff does fit the micro and mini bolts despite what the ad copy says.

UZI Pro Spare Parts Kit - IWI US

UZI Pro spare parts kit includes: Firing Pin Firing Pin Spring Firing Pin Guide Extractor Extractor Pin Blocking Latch Blocking Latch Spring Please Note: The removal and installation of these parts should be completed by a certified gunsmith. Made in Israel

iwi.us

Holy Crap! I'd seen that thread and thought maybe I could use the bolt blocking latch, but now that I look at it, I think that firing pin guide may actually work.

OK, I have a new question; does anyone know for sure if that bolt latch and firing pin guide will work with a regular semi mini bolt group? In other words is the bolt group on an UZI pro compatible enough with a semi min bolt group that the parts will interchange?

I may just buy it all just to try.

 

[slimshady]

Worth it just for the spare extractor and pin, unobtanium elsewhere right now and will work with the mini bolt. From what I have read and IIRC the pro bolt is essentially the same as the mini/micro bolts just modified as needed to work in the pro with it's side cocker.

 

[cvasqu03]

Well, I went ahead and ordered a set. If that spring guide works, I think I'll be able to use that, and the bolt block and its spring and still have some spare parts left for the rest of my projects. I'll let you all know if it all fits, but from what I've read so far I'm hopeful.

BTW, it's a pretty good deal for the parts. They're not even screwing you on the shipping. it was less than $5.

 

[StenAtopia]

Be careful with there payment site. I used to buy a lot from them a while back and only used a certain cc for online gun stuff. I was compromised twice and it had to be them or Midway.

Well, I went ahead and ordered a set. If that spring guide works, I think I'll be able to use that, and the bolt block and its spring and still have some spare parts left for the rest of my projects. I'll let you all know if it all fits, but from what I've read so far I'm hopeful.

BTW, it's a pretty good deal for the parts. They're not even screwing you on the shipping. it was less than $5

 

[cvasqu03]

Be careful with there payment site. I used to buy a lot from them a while back and only used a certain cc for online gun stuff. I was compromised twice and it had to be them or Midway.

Thanks for the heads up. I used a card I usually only use for these purposes, but I recently changed the number on it. I do monitor all my cards pretty frequently so if I think something is amiss I have no compunctions about changing it again.

 

[slimshady]

All my CCs you can set up a virtual number for online purchases. Capital One even lets you have a different number for every site, only works there so stealing the number does not do a thief anày good. Also the website let's you turn it on and off so you only have it active for a day or two while the transaction goes through. If it is compromised it takes but a few minutes to cancel and create a new one vs waiting for a new one in the mail.

 

[NorincoKid]

Do you mean you welded a receiver from pieces of a full size receiver? That's what I'd like to do as well. How did you handle the sights? Did you just use Model ! sights, or were the receiver pieces you used set up for model b parts?

I had to look at it, the kit I used appears to have been a model A kit, so it has model A sights.


It was project intended to be the cheapest way into a mini, just a blaster/dedicated pistol. I didn't give any thought to authenticity or anything else along those lines.

 

[NorincoKid]

 

[cvasqu03]

I had to look at it, the kit I used appears to have been a model A kit, so it has model A sights.


It was project intended to be the cheapest way into a mini, just a blaster/dedicated pistol. I didn't give any thought to authenticity or anything else along those lines.

You did well sir!