Phatassjay Posted August 25, 2018 Report Share Posted August 25, 2018 Bought a MI drop in handguard for my rifle. Ran into a small technical issue with the barrel nut. The handguard has 4 pins that line up with the 'divots' in the barrel nut but are not lined up. I don't have the tools to do it myself so I took it to a local gun shop. I was told at 75/hr it would take 3 hours for them to do this. I'm not an armorer but what is the correlation between the barrel nut and the gas tube? If the gas block is loosened to remove the gas tube can't the barrel nut be tightened or loosened a few mm so the pins line up? I know there are specific ft/lbs for the barell nut, shouldn't there be some tolerance either way to allow for it to be tightened ever so slightly? Any info will be much appreciated! Thanks! Quote Link to comment Share on other sites More sharing options...
Sisco Posted August 25, 2018 Report Share Posted August 25, 2018 Might try another shop. That sounds high.Look in the 308 AR archives, there are some threads on barrel nut wrenches. I paid $29 for my barrel nut wrench. Even if you need to buy a torque wrench as well they are not that pricey. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted August 26, 2018 Report Share Posted August 26, 2018 1 hour ago, Phatassjay said: Bought a MI drop in handguard for my rifle. Call MI. They're awesome at customer support. Quote Link to comment Share on other sites More sharing options...
Phatassjay Posted August 26, 2018 Author Report Share Posted August 26, 2018 Gonna call Monday but I'm sure they are going to tell me the barrel nut has to be turned a few mm. Basically the inner pins aren't seating in the sprocket on the barrel nut. Saw a video of the exact issue and they tightened the nut and it fit. Unfortunately I don't have any of the tools needed and this shop is saying it's a 3 hr job. Gonna call armalite also and see if they can give me the threshold on the ft/lbs on that nut. It just doesn't seem like a 3 hr job, maybe an hour? I think the job was too small so they blew it off and tried to sell me on a free floating handguard which I don't want. Just going to keep at it.. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted August 26, 2018 Report Share Posted August 26, 2018 (edited) 7 minutes ago, Phatassjay said: Gonna call armalite also and see if they can give me the threshold on the ft/lbs on that nut. The torque range for that nut is 30~80 ft/lbs. It's no different than any other AR-type platform. Edited August 26, 2018 by 98Z5V Quote Link to comment Share on other sites More sharing options...
Phatassjay Posted August 26, 2018 Author Report Share Posted August 26, 2018 1 hour ago, 98Z5V said: The torque range for that nut is 30~80 ft/lbs. It's no different than any other AR-type platform. Thanks for that info. Safe to say if they used 40 lbs that nut could be slightly loosened or tightened with no adverse effect? Would that be a 3 hr job? Quote Link to comment Share on other sites More sharing options...
98Z5V Posted August 26, 2018 Report Share Posted August 26, 2018 22 minutes ago, Phatassjay said: Would that be a 3 hr job? It would take me less than 5 minutes... Quote Link to comment Share on other sites More sharing options...
Phatassjay Posted August 26, 2018 Author Report Share Posted August 26, 2018 Question? Does the gas block and gas tube need to be removed to turn the nut? I'm not removing it, just tighten a couple ft/lbs to line up the sprocket with the pins on the handguard. Even if the gas block has to be loosened and the gas tube removed it sounds like it's not too involved? Quote Link to comment Share on other sites More sharing options...
98Z5V Posted August 26, 2018 Report Share Posted August 26, 2018 Remove he pin from the gasblock, that holds the gas tube in there, and you can remove the gas tube - I'd definitely do that (and I do every time) when I'm messing around with the barrel nut. Knock that roll pin out, and don't lose it, and slide that gas tube back out of the gasblock. You can twist/rotate it and take it out of the upper receiver then. Quote Link to comment Share on other sites More sharing options...
Phatassjay Posted August 26, 2018 Author Report Share Posted August 26, 2018 Thanks! Quote Link to comment Share on other sites More sharing options...
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