UZI Conversions - Mini UZI
The semi automatic Mini UZI Carbine did not enter the US until 1987 - after the May 1986 ban on new transferable machineguns - so the variety and number of converted IMI Mini's is limited. The Mini UZI SMG was in the US before 1986 as dealer samples so there were some around for class II dealers to copy. One option they had before 1986 was to chop down the receiver on a full size UZI in the same way that Vector chopped down some of the full sized Group Industries receivers. These guns are referred to as "re-welds" (from the fact that the receiver had to be welded back together after being cut down) and Fleming did some conversions this way..
So just what are those feet? The "feet" are the two rails that project out
the front of the bolt. When the bolt closes, those feet tuck inside two holes at
the bottom of the trunion. IMI chose this design because it allowed them to
reduce the length of the receiver and the overall weight of the gun, both of
which were important design goals of the Mini UZI. The sear stops the bolt on the
front of those feet, ensuring that the bolt face is far enough back for the gun
to cycle properly. But what happens on a converted bolt with no feet? Let's take
Full Size UZI:
For comparison, this is a picture of a full size UZI with its bolt charged. Notice how much distance there is between the bolt face and the back of the dummy round. This ensures that the bolt gets a "running start" and has plenty of momentum to strip off the first round.
Factory Mini UZI:
Here is a Mini UZI with a factory open bolt with feet. The bolt face is not as far back as the full size UZI, but it's well back from the rim of the case. (You can judge the distance by noting how much of the ejector is visible.)
Mini bolt with no Feet:
A Mini UZI bolt that doesn't have the feet will still run fine but there is one problem. To avoid malfunctioning on the first round, the bolt should be forward when inserting a loaded magazine.
This photo shows a bolt with no feet in a Mini UZI using a proper SMG sear. Since the magazine was inserted when the bolt was back, the first round is tilted up severely and will jam.
Mini bolt with no Feet:
This picture shows a Micro UZI (which uses the same size bolt as the Mini) with a bolt without feet and a semi sear. Note that the bolt is even farther forward (as can be seen by almost none of the ejector showing.) This happens because the semi sear pads are not as wide as the SMG pads, allowing the bolt to move father forward. Reliability is better with the proper SMG sear.
Mini bolt with no Feet:
This photo shows what happens when the magazine is properly inserted with the bolt closed and then the bolt is cocked. Instead of tilting the first round up, the bolt pushes the first round ahead slightly. Since it's not tilted at an odd angle, it will feed properly.
|Semi Auto: The Mini UZI trunion is skeletonized to reduce the weight. This IMI semi auto trunion does not need to be milled out because it's made to run with a closed bolt, which have no feet.
|Full Auto: The trunion on a full auto IMI Mini UZI has a notch milled out on each side of the trunion. That allows the feet on an open bolt to rest alongside the trunion. Without these notches, the bolt would not close all the way.
|Vector: The Vector Mini UZI is actually a cut down full size UZI and it has a trunion from a full sized UZI, which is not skeletonized. The Vector trunion has two notches milled out just like the full auto IMI. This is allowed because the receiver is already registered as a machinegun.
Note that while the trunion on the semi automatic Mini UZI
is not milled out for the feet, the rounded shape of the trunion does leave a
gap on either side. Another conversion possibility is to take a registered
factory open bolt for the Mini UZI and narrow the insides of the feet (rather
than cut them off) so they slide into the smaller gaps in the semi Mini UZI.
Although this is a nice solution, it's not something you're likely to see because the semi Mini UZI's
didn't arrive in the US until after the May 1986 end to new transferable
machineguns, so people typically didn't bother registering any of the factory
Mini UZI open bolts. It is possible to do this by cutting down a full size
registered bolt to Mini UZI size and manufacture these feet in the process. It
will then fit in an unmodified Mini Uzi receiver.
The middle barrel is a factory IMI Mini UZI SMG barrel that has had the chamber end turned down to go in the barrel restrictor ring. Again, unlike the full size UZI, this is the only modification needed to fit in an unmodified semi automatic Mini UZI receiver.
The bottom barrel is an unmodified factory IMI Mini UZI SMG barrel.
The full size IMI or Group receivers were not
designed to accept the "feet" of the Mini UZI open bolt. Vector had to cut
holes in the side of the receiver to make room for the feet.
On some Vector Mini UZI's, holes were left in the receiver for the feet to poke through. This example shows where they did weld over the holes. The vertical circle shows the area that was cut and re-welded.
This is an early Vector Mini UZI where they were trying
to copy the rear ribs of an IMI Mini UZI SMG. They had to stop short to not mess
with the original manufacturer's markings. A real IMI only has 1 long rib
on the left side rather than two.
The long vertical circle shows approximately where this receiver was re-welded.
|This is a Fleming Mini UZI Conversion showing the left IMI rear "rib". Fleming had them engraved this way rather than the factory which is just "MINI UZI".
|Here's the right side of the Vector Mini UZI with two small "ribs". Also note the use of the Model A style sights. The early IMI Mini UZI's had these sights but all of the Mini UZI's (semi automatic and SMG) shipped to the US had the Model B style sights. Vector does offer the Model B style as an upgrade.
|IMI Mini UZI's have two long "ribs" on the right side of the receiver Also note the Model B style sights found on basically all Mini UZI's shipped outside of Israel.
|The Vector trunion is actually a trunion from the full size UZI. It also uses the Model A style sights.
|The IMI Mini UZI trunion is "skeletonized" to reduce weight. Also note the factory correct Model B style sites.
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Last Modified: March 12, 2017