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Thread: New 10.5 upper issue

  1. #11
    Join Date
    Dec 2009
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    I lube the CH to reduce friction while it gets to know the upper better
    INSIDE PLAN OF BOX
    1. ROAD-RUNNER LIFTS GLASS OF WATER- PULLING UP MATCH
    2. MATCH SCRATCHES ON MATCH-BOX
    3. MATCH LIGHTS FUSE TO TNT
    4. BOOM!
    5. HA-HA!!

    -WILE E. COYOTE, AUTHOR OF "EVERYTHING I NEEDED TO KNOW IN LIFE, I LEARNED FROM GOLDBERG & MURPHY"

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    I am American

  2. #12
    Join Date
    Feb 2013
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    Colorado
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    Quote Originally Posted by yfz View Post
    A little bit of play between the lower and upper is not an issue. Even if your upper and lower have a very tight fit they are going to loosen up after you put a few hundred rounds through the gun. Do not use a wedge to make up for the play. They will only cause you more trouble down the road if they fall apart.
    Quote Originally Posted by justin_247 View Post
    A little bit of play is perfectly acceptable, and the mil-spec allows it. If you can fit a .020" feeler gage in any of the areas between the pivot pin lugs with the upper fitted to the lower, it is out-of-spec. Otherwise, it's good to go.
    Quote Originally Posted by 6933 View Post
    As has been said, some play is fine. The streaking on the top of receiver is fine. Accuwedges are POS's that can cause issues if get into FCG. Stay away from them. No need.
    Quote Originally Posted by Iraqgunz View Post
    In addition wait until you see some rear lugs that have been worn down because people force the steel take down pin into the hole and it wears it out.

    Accucraps serve no purpose at all.
    Okay. I guess. But I asked how much wobble there was, and while some play may be acceptable, I don't think it should be excessive on a brand new upper/lower. I assembled 3 rifles since I started building (a rookie) and all of them were a tight fit between upper and lower, and all of them have several hundred rounds through them with no noticeable degregation in the tight tolerance between the upper and lower. My one factory build is an SR-15E3, and as expected the fit is tight. I suppose it makes sense that my rifles will develop some play over time, but I haven't experienced it yet. I'm full-time active duty, and the assigned M4s I've fired throughout my career do show some play between upper and lower, but I attribute that to lots of range time, Soldier abuse and the constant breaking down (assembling and reassembling) of the rifle. I don't use accuwedge and never had a need to. Just didn't know they were bad to use. Learn something new in this hobby everyday.

  3. #13
    Join Date
    Apr 2012
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    Thanks guys. Upon further inspection it appears that the mark is "shiny black" and is not through the coating. The flash made it appear to be silver, bare metal. I am still trying to gauge the amount of play between the receivers, as I do not have a feeler gauge at the moment, and I only have one other AR to compare it to (and that rifle is tight). As much as I want to think I know what I am doing, I am still a relative newbie in the AR game.

  4. #14
    Join Date
    Jun 2006
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    You should contact the manufacturer and see what they say.
    Stick


    Board policy mandates I state that I shoot for BCM. I have also done work for 200 or so manufacturers within the firearm community. I am prior service, a full time LEO, firearm instructor, armorer, TL, martial arts instructor, and all around good guy.

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  5. #15
    Join Date
    Jan 2008
    Location
    AZ-Waging jihad against crappy AR's.
    Posts
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    You are focusing on a non-issue. Please contact PSA and ask them to address the problem. This is now closed until you hear back from them.

    Quote Originally Posted by Gerbilphooey View Post
    Thanks guys. Upon further inspection it appears that the mark is "shiny black" and is not through the coating. The flash made it appear to be silver, bare metal. I am still trying to gauge the amount of play between the receivers, as I do not have a feeler gauge at the moment, and I only have one other AR to compare it to (and that rifle is tight). As much as I want to think I know what I am doing, I am still a relative newbie in the AR game.



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