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Old 05-05-2013, 02:26 PM   #1 (permalink)
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So I found a BE Nightmare LB Comp at a gun show and it doesn't hold air

I found it sitting next to a few shotguns and rifles and asked the kid behind the table if it worked, of course he said yes. Its a LB Comp but the feedneck is missing, not a big deal since I can still use the stockclass feed tube. I get it home and put a 12g in it and it dumps it in seconds. Apparently it doesn't work... not a big deal since its in pretty damn good shape and the price wasn't terrible. Of course I tore it down immediately and then hopped on here and found out that's a bad idea. Still leaks after reassembly, I see that I should de-bur the lower tube, whats the recommended way? Orings I can find but I see that the main seals in the valve are a problem, is there anyone around that can point me in the right direction?

A feedneck would be awesome but thats not a big deal unless I get this thing running. Honestly I might just put a sight rail over the hole and use it in stock class form if I can get it going.

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Last edited by DarkNinja; 05-05-2013 at 02:31 PM.
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Old 05-05-2013, 02:53 PM   #2 (permalink)
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Wow that is in beautiful shape! I am curious to know what you got it at.
Mad made a attempt at making some seals for these awhile back, not sure what the final out come was. Try and pm him, great guy to work with.
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Old 05-05-2013, 07:50 PM   #3 (permalink)
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It's an LB Comp, with the cut-out for the 12g.

Nightmares only lived up to the name when you had to fix 'em.
But there's an old-school trick for putting them back together.

You need what Machinists call Brass Shim-Stock.
You wrap the valve assembly with 0.015 Brass, lube it up well and slide the wrapped valve through the threads of the body, then pull the brass "sleeve" out.
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Old 05-07-2013, 12:54 AM   #4 (permalink)
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One thing, if you want to play stock class with this, look into something that can fit over the top tube opening and slide back and forth. I played with one that I picked up a month ago. Didn't leak, surprisingly, but having to unscrew the feed plug, on a LB, load, and then close it can be a bit involved. That hole will make reloading easier. I am not sure about Mad having made any seal kits. I think that there was a crucial seal that he could not replicate.
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