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Forums
The Range
NFA & Class III Discussion
FA Uzi firing FA when set to Semi
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<blockquote data-quote="rocketman" data-source="post: 3040469" data-attributes="member: 24956"><p>If its not a short stroking problem its a trigger/sear timing issue. The little block pinned to the front of the trigger (I call it the disconnector)must fall off (release) the inner sear tabs at the same time or preferably very shortly after the sear releases the bolt. That way the sear can move back up and catch the bolt after the first round. The mechanism relies on the finger pressure applied to the trigger causing a sudden movement backward in the trigger after the bolt is released and trigger pull lightens. This tells me Uzeil designed semi auto to be fired like a shotgun not a varmint rifle. If this is the problem, it should fire single shots if you pull the trigger quickly and fully to the rear...and fire doubles when you squeeze the trigger slowly.</p><p></p><p>To improve it:</p><p>Try replacing trigger, disconnector, and/or sear. One might be worn down in any of the wear spots which cause this.</p><p>Check top cover to bolt clearance. If the top cover allows the bolt to sit too high this can cause it. Bend cover as needed.</p><p>Move grip housing closer to receiver if it is loose or sitting low(bend front housing tab down or check for rear pin hole wear).</p><p>Put a shim under the arm on the front of selector lever that the disconnector trips on in semi mode.</p><p>File tabs on sear(avoid !!!).</p><p>Jerk trigger, don't squeeze.</p><p></p><p></p><p>The opposite problem is when the trigger block falls off the sear before it releases the bolt. You would hear a click only then have to pull the trigger and second or third time to get it to fire or possibly not at all. These problems apply the semi auto closed bolt guns too.</p></blockquote><p></p>
[QUOTE="rocketman, post: 3040469, member: 24956"] If its not a short stroking problem its a trigger/sear timing issue. The little block pinned to the front of the trigger (I call it the disconnector)must fall off (release) the inner sear tabs at the same time or preferably very shortly after the sear releases the bolt. That way the sear can move back up and catch the bolt after the first round. The mechanism relies on the finger pressure applied to the trigger causing a sudden movement backward in the trigger after the bolt is released and trigger pull lightens. This tells me Uzeil designed semi auto to be fired like a shotgun not a varmint rifle. If this is the problem, it should fire single shots if you pull the trigger quickly and fully to the rear...and fire doubles when you squeeze the trigger slowly. To improve it: Try replacing trigger, disconnector, and/or sear. One might be worn down in any of the wear spots which cause this. Check top cover to bolt clearance. If the top cover allows the bolt to sit too high this can cause it. Bend cover as needed. Move grip housing closer to receiver if it is loose or sitting low(bend front housing tab down or check for rear pin hole wear). Put a shim under the arm on the front of selector lever that the disconnector trips on in semi mode. File tabs on sear(avoid !!!). Jerk trigger, don't squeeze. The opposite problem is when the trigger block falls off the sear before it releases the bolt. You would hear a click only then have to pull the trigger and second or third time to get it to fire or possibly not at all. These problems apply the semi auto closed bolt guns too. [/QUOTE]
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NFA & Class III Discussion
FA Uzi firing FA when set to Semi
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