Building the Semi Automatic Uzi – Part 5 of 6 : Bolt and Final Assembly

See Parts 1 through 4 for the steps that need to be done, before you finish the build in this post.

Install the Folding Stock and Retaining Bolt.

The stock needs to be installed now before you install the bolt. Because the retaining bolt sits behind bolt and buffer block.


The round part of the retainer nut, hangs out the back of upper receiver.

Here is the stock I used. There several types of metal and wooden stocks available. You may have to use a wooden stock with this gun, depending on gun laws in your state.  In my state, I can use anything.e an


Look at the back of the Uzi upper receiver. This is a round hole.  You put the retainer inside the upper receiver and it will stick out a little bit. You now take the stock and align it with the back of the receiver and you can insert the bolt and screw through the hole at the back of the receiver into the retainer bolt.  You need to keep pressure on the retainer nut, while you screw in the bolt.


Once hand tightened, you need a allen/hex bit or driver to completely tighten the stock.  Once the bolt has been completely tightened, you can fold the stock under the receiver.

Assemble the Striker


The 3 holes in the different pieces must line up.

Take the black cylinder with a ridge on the end of it and insert it to the striker as shown above.  Not the holes in the black cylinder, the striker assembly and the firing pin itself. You must line up those holds and then inert the pin through all three items in order to hold it in place. Then insert the firing pin spring on the black cylinder.  The spring slides over the black cylinder.

Here is what the Striker looks like when it is finished.


assembled striker

Recoil Spring

The recoil spring is a large spring that will push the bolt back forward again to load another bullet and cock the action.

When you buy it separately or in a parts kit, it comes with a hard cardboard tab at the end of the spring. Very carefully cut the cardboard off without damaging the spring.

Here it is before


And after you cut off the orange brown tab.


Install Extractor into the bolt assembly

Here are the extractor and the pin that holds in in the bolt


extractor and pin


bolt and pin alignment

You can tell which end of bolt that the extractor is installed into but located the hole on the side of the bolt for extractor retaining pin. Then slide the bolt into the bolt assembly. Line up the notch in the extra to the hold and push the retaining pin in.

After the extractor is installed the inside of the bolt should look like this:


extractor position

Installing the Blocking Latch

The blocking latch prevents (or at least reduces) the possibility of having a round go off out of battery. If the round doesn’t chamber properly for any reason (bad ammo, dirty gun,…).  the a small spring and a small pin hold it in place. The spring and latch look like this:


latch and spring

It is inserted into the rear of the bolt assembly into a next to where the extractor was inserted.  Here is a diagram of the locations where the extractor and the blocking latch are inserted into the bolt.


Bolt assembly

Striker and Bolt

Put the striker spring on the opposite side of the firing pin on the black clyinder. Then insert the  large recoil spring in the round hold in the rear center of the bolt.  It will look like this:


striker into bolt

Twist the striker assembly so the black lever fits into the groove on the right side of the bolt.

Here is a closeup of the two components fitting together.


closeup striker into bolt

Take the black buffer block and position it so the recoil spring goes in the hold at the top and the striker spring does into the larger hole at the bottom.


completely assembled bolt, striker, and buffer

Be careful with the whole assembly, it is not fixed together. The components will fall apart if you are not careful.

Now you take the whole assembly and insert it ,buffer block first into the back of the receiver.  You will have to compress the spring by compressing the bolt towards the buffer block.  The buffer block will slip mostly out of site under the top cover catch and rear site assembly.  It will look like this.


bolt in gun

Once the buffer block is in place under the rear site/top latch, keep compressing the spring until the whole block fits into the receiver.

Now you can put the top cover on.  You will have to push the top cover latch back to put the top cover on. Then release it and it should spring forward and hold the top cover on.


top cover

Joining the top Receiver and the Bottom receiver

The bottom of the top receiver has a hole with a tab on the front of the bottom receiver will fit into.  Here’s the bottom of the receiver. I have circled in red the areas where the bottom receiver/pistol stick will attach to:


where lower attaches

So take the bottom  receiver/pistol grip stick and a angle and try to get the tab to fut into the opening (red circled).


lower into upper

Once you have the bottom part inserted into the tab of the upperpart, then push the bottom towards the upper until it touches.

Then a pin mm is inserted through one side of upper, through the lower and out of the other side of the upper. Use a rubber hammer to push the pin through The hole win the pin is inserted is circled in red in the picture below.


Here’s the pin


Try to Dry Fire it

Once the pin is installed, you are done, the built is complete. You can now test to see if the components are properly installed by pulling back on the cocking handle on the top cover, then releasing it.

Now try to dry fire it by simultaneously holding the grip safety and pulling the trigger.  If it goes click, then you are mostly likely ready to test it with blanks or real bullets.  If it does not dry fire, you may have to take the upper and lowers apart and the top cover off to inspect the fit of the parts, or to see if there is something impeding the bolt or the trigger.

Here is my finished semi-automatic UZI Carbine. In my final post, I am taking the gun to the range and will have pictures and video of the first time we shoot it.


UZI Build Complete

Build your self a fully legal, semi automatic Uzi Carbine – Part 1 of 6 : Introduction

I am not really that useful as a gunsmith.  I have a son who has built several Ar-15s, including a really nice one for for me.  I looked into building a AK and the tools you need for that are more expensive then buying a new AK. So I looked into Uzi’s.  Semi Automatic versions of Uzl’s are readily available and I decided that I needed to build one.  So I went out and bought a Semi-Automatically, Fully Welded receiver and a parts kit.  I will be documenting the steps required to built this over the next two weeks.  I would like to state for the record that US built Semi Automatic parts are being used.  The barrel size is 16 inches, which makes it legal without any SBR permit.  I am also using an Uzi Stickgrip modified to be only semi-automatic.  It will use a semi-automatic sear and have the required number of US built parts. It is completely legal in the state that I live in. I live a FREE STATE. I bought the Uzi receiver from a Federally Licensed Dealer (FFL) and I passed the Federal Background check before I was allowed to take the receiver home.  The only restricted part according to the ATF is the receiver. All the other parts could be shipped directly to my home.

The next post will detail the parts you need and where to get them.