rogtack Posted January 21, 2015 Report Posted January 21, 2015 Hey guys, this is my first build and I didn't find anything with the search feature. I received my Rainier Arms barrel and MI hand guard today. I snugged everything down by hand just to make sure it all fit correctly and there's a gap between the barrel nut and upper. The gap is .154". Is this gap normal??? Or will it seat all the way once it gets tightened with a torque wrench? It's a Cross Machine Tool upper. Thanks.
98Z5V Posted January 21, 2015 Report Posted January 21, 2015 (edited) Perfectly normal. Shoot it. Very few combinations out there have zero gap. That's fine. EDIT - on second look, that's pretty fucking awesome. SMALL gap. Blast it. Edited January 21, 2015 by 98Z5V
FaRKle! Posted January 21, 2015 Report Posted January 21, 2015 As long as it's torqued properly and not cross-threaded you'll be fine.
survivalshop Posted January 21, 2015 Report Posted January 21, 2015 And as long as the Barrel's seating flange is seated flush against the Upper receiver & a notch on the Nut for the gas tube line up . From your photo ,the seating of the rail to rail , the Hand guard is not going any further, but that doesn't mean the Barrel nut will not go further in , when torqued properly .
Lincoln7 Posted February 27, 2015 Report Posted February 27, 2015 I just experienced this on my PSA 308 AR after I installed the MI handguard. The gap created here allowed my dust cover pin to walk forward while shooting and come out of it's rear pin locator hole. The dust cover stayed attached but it looked like it was about to fall off. I have not found a solution yet. It appears your rifle does not have a dust cover, correct?
survivalshop Posted February 27, 2015 Report Posted February 27, 2015 " Check Brownells , they have a 308 dust cover that is spring loaded at both ends , no long pivot pion ." Dead On Arms , LCC" , but Brownells is out of stock on them right now . Maybe you can find them some where else or right from the co..
Lincoln7 Posted February 27, 2015 Report Posted February 27, 2015 Thanks for the heads up on that dust port cover. Here is the link for anyone interested: http://www.brownells.com/rifle-parts/receiver-parts/ejection-port-cover-parts/ejection-port-cover-assemblies/pin-less-ejection-port-cover-assemblies-prod73296.aspx I came up with a temporary repair for the time being. I gutted a length of paracord and wrapped it around the threaded portion of the receiver and tied it. It stops the ejection port cover pin from walking forward enough to prevent it from falling out. Crude, but it works. I'm thinking I might make a longer dust cover pin or cutting a groove to install a C clip. Here is a pic of what I have now:
survivalshop Posted February 27, 2015 Report Posted February 27, 2015 (edited) C-clip on pivot pin may not help, but cause enough resistance to stop pin movement . That para cord my melt in there & cause problems with easy removal . You could also make an extension , albeit ,a thin walled one , that would restrict its movement enough so the cover pin would not come out of the blind end in the Receiver . A large C-clip in that gap attached to the Upper Receiver Barrel nut threads , but you would have to remove the Barrel nut to install it . Edited February 27, 2015 by survivalshop
FaRKle! Posted February 27, 2015 Report Posted February 27, 2015 That para cord my melt in there & cause problems with easy removal . I'd imagine he'd have to be shooting full auto for it to get hot enough there to melt paracord. There's a lot of heatsink there.
Lincoln7 Posted February 27, 2015 Report Posted February 27, 2015 I think you're right about it melting. I looked at it closely afterwards and it's just barely touching the gas tube. Not sure on the melting temp of paracord but that gas tube gets toasty. 5.56 AR's use a small C clip to prevent the dust cover pin from walking rearward. Not needed on the 308 as the rear hole in the receiver is blind. I'm considering removing the pin and welding an extension on. Or finding 4.5" of .125" diameter steel pin...
Lincoln7 Posted February 27, 2015 Report Posted February 27, 2015 Maybe I'll be okay... "GI spec paracord is easy to work with, cut and melt and features inner nylon cords are made from high-tenacity, light resistant and heat-resistant polyamide with a melting point of 244 degrees Celsius." About 470F
Lincoln7 Posted February 27, 2015 Report Posted February 27, 2015 Armalite sells a longer pin. You are correct. http://www.armalite.com/ItemForm.aspx?item=EA1170&Category=0db4d594-2661-45e9-b54d-c537311725f1 Thanks! I'll probably go this route.
AngelDeVille Posted February 28, 2015 Report Posted February 28, 2015 You are correct. http://www.armalite.com/ItemForm.aspx?item=EA1170&Category=0db4d594-2661-45e9-b54d-c537311725f1 Thanks! I'll probably go this route. I didn't know why, until now....
survivalshop Posted February 28, 2015 Report Posted February 28, 2015 Armalite sells a longer pin. That ,I didn't know, good job <thumbsup>
Lincoln7 Posted February 28, 2015 Report Posted February 28, 2015 For a $5 pin Armalite wants $20 to ship it to me! I think I'll be making my own, haha.
AngelDeVille Posted February 28, 2015 Report Posted February 28, 2015 For a $5 pin Armalite wants $20 to ship it to me! I think I'll be making my own, haha. Maybe it comes with a handy j from the ups driver?
Lincoln7 Posted February 28, 2015 Report Posted February 28, 2015 Maybe it comes with a handy j from the ups driver? Gosh, I sure hope so!
FaRKle! Posted February 28, 2015 Report Posted February 28, 2015 For a $5 pin Armalite wants $20 to ship it to me! I think I'll be making my own, haha.Try giving them a call.The only other place I've seen that pin is at a Canadian dealer...
edgecrusher Posted February 28, 2015 Report Posted February 28, 2015 For a $5 pin Armalite wants $20 to ship it to me! I think I'll be making my own, haha. Call them. They may drop it in an envelope for you.
Lincoln7 Posted February 28, 2015 Report Posted February 28, 2015 (edited) Call them. They may drop it in an envelope for you. Good idea. I shall try and get back to you. Edited February 28, 2015 by Lincoln7
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