  | ar upper help! |
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03-07-2012, 09:34 PM
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Bronze Member
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Join Date: Feb 2012
Location: wichita ks
Posts: 79
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ar upper help!
I have a Surplus Ammo&Arms lower that need tweeking,i'v had 3 uppers on it and only one fit really nice,the bushmaster. the YHM and DMPS both fit good on the pivot pin but the rear is REALLY tight.any ideas? my thought was the holes are supposed to be for a .156 pin plus a few thousands for clearance so i'm wondering about a reamer to remove just the hard coat in the rear hole,.001-.002 i have precision pins and a good selection of reamers so i can get to within .0005-.001 of what it is now with the coating in the hole then just remove the .001-.002 of coating.
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03-08-2012, 07:26 AM
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Silver Member
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Join Date: Dec 2005
Location: Longmont, Colorado
Posts: 290
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Re: ar upper help!
I've read in a few places that it will loosen up after you shoot them a few hundred rounds. Have you shot this rifle much with the tight upper/lower configuration?
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03-08-2012, 08:28 AM
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Platinum Member
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Join Date: Jan 2008
Location: UPSTATE
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Re: ar upper help!
Quote:
Originally Posted by ilscungilli
I've read in a few places that it will loosen up after you shoot them a few hundred rounds. Have you shot this rifle much with the tight upper/lower configuration?
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This is true, however I would return everything you bought and start over with mil spec componets. Who made that lower again?
When you say "fit real nice" what does that mean? Please be more decriptive.
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03-08-2012, 11:49 AM
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Bronze Member
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Join Date: Feb 2012
Location: wichita ks
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Re: ar upper help!
Quote:
Originally Posted by ICANHITHIMMAN
This is true, however I would return everything you bought and start over with mil spec componets. Who made that lower again?
When you say "fit real nice" what does that mean? Please be more decriptive.
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the rear pins are so tight that once there pushed in you have to flip the weapon over and drive the pin out. the bushmaster upper fit good,not loose, but you could push the pins out with a finger. the YHM & DPMS there would be no field dissasymbly.
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03-08-2012, 12:26 PM
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Platinum Member
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Join Date: Jan 2008
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Re: ar upper help!
Ok that sounds fine they will losen as you shoot it.
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03-08-2012, 01:58 PM
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Bronze Member
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Join Date: Feb 2012
Location: Texas
Posts: 73
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Re: ar upper help!
i had a similar issue, after 300+ rds it loosed up real nice
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03-08-2012, 09:34 PM
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Bronze Member
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Join Date: Feb 2012
Location: wichita ks
Posts: 79
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Re: ar upper help!
thanks guys, i did run a reamer in them today,took off.001, from a .251 hole to .252, the rear hole is an oval hole not round so it only hit in the center,just knocking off the hard coat but made a ton of differance,now they slide in smooth with out forcing them but yet still a little stubbern to get out. now all i need is my 6.5 grindel barrel and i'll have another upper ready to go!
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