wwiifirearms Posted May 17, 2013 Report Share Posted May 17, 2013 Picked up my Sten MkII Neal Smith tube gun today and couldn't wait to get to the range.Then came the "Buzz Kill"...In Full Auto position it fires only Semi, and in Semi it won't fire at all.:-(A little poking around and I can see the Sear Lever just barely touches the bolt when in the FA position. Just enough that when manually cycled it appears to work, but under the violent recoil of live fire that light touch is enough to reset the trigger. I the semi-auto position the sear lever is held down just enough to cause the notch in the sear lever to slip off the sear without moving the sear to release the bolt.I found drawings showing the leg on the sear at 26mm(1.023 in). Mine is 1.035 inches, or about 1/4mm longer than the drawing(looks new, likely a recent replacement). I think the pin holes are also pretty loose looking, and being a tube gun, it may be out of spec in several demensions which collectively add up to "it don't run".So my question is, anyone ever have to "adjust" a sear lever on a Sten?Anything else I should try before filing down the sear lever?ThanksRay Link to comment Share on other sites More sharing options...
timkel Posted May 17, 2013 Report Share Posted May 17, 2013 This is from memory....For full auto, doesn't the selector switch push the trip to the side? So the bolt does not hit the trip at all? And when selector set to semi, the trip swings back under bolt, to trip at each cycle of bolt.Sounds like something is out of alignment, bent or just not assembled correctly. Link to comment Share on other sites More sharing options...
wwiifirearms Posted May 17, 2013 Author Report Share Posted May 17, 2013 There is a step on the bottom of the bolt that is only on one side. In semi position the lever is hit by this step, causing the trigger/sear to reset. In full auto position the lever is moved to the side without the step so that the trigger/sear does not reset.Because the lever is too tall, it hits the bottom of the bolt even when on the side without the step.When on the side with the step it hits the bottom of the bolt even more, preventing the lever from engaging the sear. I'm pretty sure that taking about 0.020in. off the height of sear lever will solve both issues. It is a cheap part($5 ea), so I will try that first. I ordered some spares today.-Ray Link to comment Share on other sites More sharing options...
timkel Posted May 17, 2013 Report Share Posted May 17, 2013 Ok....now I remember. Grind it or just bend it. Link to comment Share on other sites More sharing options...
wwiifirearms Posted May 17, 2013 Author Report Share Posted May 17, 2013 Took .020 in. off the sear lever and everything seems to work perfect through two mags.I'll try more testing when I can get more range time.-Ray Link to comment Share on other sites More sharing options...
21 smoker Posted September 24, 2013 Report Share Posted September 24, 2013 Same thing happened to me..many moons ago...first trip to the range instilled the notion you had better be prepared to fix most MGs at sometime or another.I remember taking a York tube MKII apart several times to "gently file" the sear lever....only to have a buddy grab it and grind it on the cement floor of the range....worked beautiful ever since Link to comment Share on other sites More sharing options...
m3bobby Posted September 25, 2013 Report Share Posted September 25, 2013 I think I remember there was an EMER about new levers having a flat added to the trip end, I'll need to have a look. Link to comment Share on other sites More sharing options...
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