UZI Conversions - Full Size
The Model A and Model B semi automatic UZI carbines all had a bolt blocking
bar welded to the inside of the receiver. This bar prevents an unmodified SMG
bolt from being used in the gun and was required by the ATF to get approval to
sell the gun in the US. Removal of this bar is considered to be manufacturing a
machinegun, and results in what is known as a "registered receiver". That is the
preferred way to convert an UZI and permits the use of unmodified SMG bolts. Not
all of the transferable registered receivers converted before 1986 had the
blocking bar removed. Some people registered the receiver but used a slotted
bolt with it. In those cases, the bolt was usually unmarked (since it was not
the registered part) but it is "married" to the receiver because separating it
from the receiver would create an unregistered machinegun. Because of that, a
registered receiver that still has the block bar attached is no more versatile
than a registered bolt.
Since May of 1986, only class II dealers can create a new machinegun by removing
the blocking bar and the gun is considered to be a dealer sample, not
transferable to individuals.
It has been reported that some of the early semi automatic Model A carbine's that came into the US had a fully supported bolt face. Representatives from IMI have denied it and the ATF probably wouldn't have allowed it, but it's possible that IMI forgot to mill off the lower lip on some of the bolts or the ATF didn't initially realize that it was an issue. It's also possible that IMI made these bolts available separate from the guns for conversion purposes. Regardless of how they got here, original slotted IMI closed bolts with a lower lip do exist but they are quite rare. They would have been an ideal bolt to register prior to 1986, requiring no modifications to the receiver or the bolt.
When transferable conversions were being done in the 1980's, surplus UZI parts were harder to come by and more expensive than they are today, so there was more incentive to convert existing semi parts then to replace them with SMG parts.
Conversions could also be done via registered sears. Fleming removed the bolt blocking rail from the receiver and engraved his information on the bottom of the receiver as seen in the picture below. The sear was also crudely engraved with the same info with a vibrating pencil engraver. These sears are permanently married to the receiver and cannot be removed. While this information may not be documented on the current form the gun is on, it should be. Qualified did some registered sears that are not married to the receiver but are extremely rare.
As a final touch, people doing conversions may have restamped the receiver markings to make the gun look like an original SMG. Most conversions were not remarked. Fleming did a "Basic" and "Deluxe" UZI conversion. The Deluxe consisted of remarking the receiver to say "UZI SMG" (although a factory IMI UZI should really be marked "SMG UZI"). The Deluxe also had the lower remarked to ARS while the Basic was usually AFS.
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Last Modified: March 12, 2017