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Posted: 11/20/2008 7:45:10 AM EDT
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Rebarreled my Bushmaster last week and would like to get y'alls reaction to how it went.
Put the new barrel on and torqued the barrel nut to 30 ft lbs. Of course, the barrel nut slot did not line up for the gas tube (Murphy's law). I backed off and retorqued a few times. Yes, grease was used. Finally, I just turned that sucker on until the next slot lined up for the gas tube. Not sure of the torque at this point. I figured it had to go on there. It was about all I could do to JUST get the slot lined up so the gas tube would go in (since my vice was clamped to a portable workmate type bench that kept flexing and lifting up on me. This brings up a few of questions: 1. Are there ever situations where there is no barrel nut slot/gas tube line-up between 30-80 ft lbs of torque? If so, what does one do then? 2. Upon inspection, the gas tube does slightly contact the carrier key as the bolt carrier goes forward. It's very slight, there's no binding or anything. Is this a problem? If so, how to fix? I would like to turn the nut on a bit more to line it up perfectly, but it's pretty darn tight, and I don't think I can torque the barrel nut on any tighter with my current setup. Regards, |
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I've had several go together the way you describe. Ya gotta get the tube through no matter how high the actual torque (Within Reason), or file the slot in the barrel nut. One went to 90+ before it lined up enough to squeeze the tube through. On the other end it was 20ft.lbs when it lined up. I'd rather have it a little too tight than just Finger tight. No trouble with any that turned out this way. In fact the one I mentioned is the most accurate Carbine I own.
If you need a Minor Adjustment of the Gas Tube in the Carrier Key, it's alright to make it in the upper. Just make it minor.... Even the back end of the appropriate drill bit will work to make the adjustment. Push it in an inch or so. Caution not to break the drill bit when doing the actual alignment though. SO-13 |
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How many times did you back off and re-torque? The standard procedure is to tighten and then loosen twice, then tighten a third time to between 30 and 80 ft-lbs.
It's important to make sure EVERYTHING is extremely clean, and that there isn't something in the way of the pin or on the flange or something. Even just a little bit of gunk can really mess with you. |
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Quoted:
I don't see how the slots don't line up. What if you start at 50 ftlbs then work your way up to 80 ftlbs and just get the first slot that comes your way The minimum torque is 30 ft/lbs, not 50. That's an awful lot of range to get one notch to line up, but it happens sometimes. This is why the "torque it three times" method is important. And even then, sometimes there's a problem. |
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Quoted:
since my vice was clamped to a portable workmate type bench that kept flexing and lifting up on me.
And this, my friends, is why a solidly mounted vice is a necessity. I you are using an action block that covers the entire block you can do what I did before I got a vice. Take a quick grip or C-clamp. Clamp the block down to kitchen table or counter. This worked well for me. Will try and post a pic in this forum when I get my block back. OH yeah WARNING FOR YOU MARRIED MEN do not do this on your kithen table or counter while your wife is home. I am single so I get to do what ever I want at my house. |
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