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Posted: 7/27/2012 2:55:07 PM EDT
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I bought a RR Group/Vector Uzi. I will Post photos later. Every looks fine and all. The lower is marked A (Auto) R (Semi) S (Safe) when the bolt is back the in A or R and I pull the trigger w/o squeezing the grip safty the top cover reises up some. Then if I squeezing the grip w/o pulling the trigger the bolt closes. The same thing happens if I pop open the stock hard and fast but only 1 in 20 times. I will grip the grip safty and the bolt closes. Any thoughts? |
| Richard Hofmann at BWE Firearms is the man for all UZI issues. He can certainly help you with this. [email protected] |
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Sounds like there is enough room for the bolt to get over the sear. I suspect that the top cover is loose and creating too much internal space.
Take a look at this page, which gives you a way of measuring the bolt/cover gap and adjusting the cover to fit. |
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I am not an Uzi expert my any means but some engagement surface is off between the sear, bolt, and top cover.
My guess not seeing your gun is that the sear and/or sear spring is worn. On an Uzi when you pull the trigger even without the grip safety depressed the sear will usually move downward a little bit. If the sear is worn or "rounded" this allows the bolt to start to move forward and ride up a bit on top of the sear. The reason the bolt doesnt go completely forward is that it then gets "bound" between the sear (which instead of presenting a vertical ledge may be more like a rounded "ramp"). The bolt moves forward and goes up the ramp created by your sear until it eventually binds between what is left of your sear and the top cover. The sear is also held in place from going down any further by the grip safety mech. However, once you depress the grip safety the recoil spring in the bolt can now easily depress the sear out of the way and away it goes. On an Uzi the sear is only "locked" in the upward position by the grip safety. You can see this for yourself by taking your top cover off, removing the bolt and pushing down on the sear. With the grip safety in place the sear shouldn't move. However, depress the grip safety (don't pull the trigger) and you will see the sear can easily be pushed downward and out of the way. Since the bolt has overcome any vertical locking surface remaining on the sear (by you previously pull the trigger and it moving slightly) the bolt is free to push the sear down and out of the way once the grip safety is depressed and releases the bind created by the three way relationship between the sear, grip safety, and topcover. This also explains why when you hit the stock open with the bolt retracted the bolt is jumping whatever remaining engagement suface is left until you push the grip safety allowing the bolt to press its way past the remnants of your rounded/ramped sear. As Southern Raider also mentioned your top cover could be worn as well as it is cricital to maintaining the bolt orientation to the sear. You could probably easily test this by locking your bolt back and then using a pencil (so you dont mash your finger if it goes all the way forward), push up on the bolt and see if the bolt exhibits this same forward lurch behaviour jumping the sear engagement surface. Is the bolt stays in place but only exhibits the lurch forward behavoir with the trigger is slightly depress than it is most likley the sear which is worn. An open bolt subgun with sear engagement issues is an accident waiting to happend. If I were you I would replace the sear, sear spring, and topcover just to be safe as Uzi parts are cheap and plentiful, so why take the risk trying to figure out which one it may be. |
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Without actually seeing it, my guess is that your top cover is bent. The top cover should not bind on the bolt as it moves back and forth, but it has to be tight enough to not allow the bolt to move vertically. If the bolt can rise up, it will jump off the sear.
Fortunately, the top cover is sheet metal like the rest of the gun and can be easily adjusted if you are handy with simple tools. Parts kits for the UZI are still pretty cheap, so I would buy one (or two) and stash them away. That way you will have all the spare parts you might need in future. Here's a good link for a new UZI owner: http://files.uzitalk.com/reference/pages/article_uzimaintenance.htm UZItalk is the board for all the UZI fans and they have forums for other guns like MACS also. |
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