Page 3 of 3 FirstFirst 123
Results 21 to 23 of 23

Thread: Blown Primers with AE .223

  1. #21
    Join Date
    Oct 2006
    Posts
    1,175
    Feedback Score
    3 (100%)
    Quote Originally Posted by AR15barrels View Post
    Heavier buffers increase the TIME that it takes for the carrier to get moving, unlock the bolt and extract the case.
    The timing of the AR is critical.
    If you try to extract before the barrel pressure has dropped (when bullet leaves the bore), the case is still holding on to the chamber walls.

    Read through my "how it works" thread again.
    This is covered there.
    I've been looking through your links, and it appears that you describes to a T my exact problem in the "how it works", I still have the cases, and just as described in your link, there are also marks where the ejector is located on the bolt face. Sorry for not reading it through sooner, I was busy getting lot numbers and opening packs to find what color the dividers were. (No offense Snake RAH )

    Now that I have a better idea of what's going on, what weight of H-buffer is most recommended to alleviate these problems? I see H (with one tungsten weight, I assume its the lightest) all the way to H-3 (with three weights of tungsten and a higher price tag, I assume its the heaviest) Which one would match the needs of someone who is running a semi-auto carbine?

    Also, this is a side note, with my old upper ( BM, bought around 2004) my CAR buffer never had any marks on it at all, now, ever since I've had it on my newer upper (2005 BM) it's had scratch marks against the buffer face. I thought this might be important after reading this line of your description of overpowered rounds.


    "Recoil will be higher than normal when the carrier is allowed to travel to the end of the buffer tube and bottom out swiftly against the end of the buffer tube. In normal operation, the buffer just kisses the end of the tube."

    What might this mean? To be sure though, I'm picking up a new carbine spring with whatever H-Buffer I end up buying.


    Thanks, you've been a great help, its nice to see someone with real knowledge helping someone like me get everything running smooth.

  2. #22
    Join Date
    Jun 2006
    Location
    NoVA
    Posts
    10,780
    Feedback Score
    17 (100%)
    I run a H (2.9oz) in anything with a carbine gas system. In certain guns I run a H2 (3.8oz). Whichever you choose be sure to test that the rifle will still lock the bolt back when it runs empty. You do this by taking several mags and loading with only 1 round and fire it, do it 10 or 15 times to make sure it'll lock back 100% of the time. If it doesn't then you have a gas leak somewhere.

    Here's a small list of buffer weights that I've gathered and weighed myself:

    CAR buffer 2.96oz
    Bushmaster H buffer 3.75oz
    CMT H2 buffer 4.57oz
    CMT H3 buffer 5.43oz
    Enidine hydraulic CAR buffer 4.34oz (newest type, softer spring rate)
    Enidine hydraulic rifle length buffer 5.84oz
    Bushmaster rifle buffer 5.2oz
    Colt 9mm buffer 5.6oz
    MGI rate reducing buffer 7.1oz.
    Chief Armorer for Elite Shooting Sports in Manassas VA
    Chief Armorer for Corp Arms (FFL 07-08/SOT 02)

  3. #23
    Join Date
    Dec 2006
    Location
    Commonwealth of Virginia
    Posts
    3,749
    Feedback Score
    2 (100%)
    I had the same experience with my Bushy Varminter a couple of years ago. The ammo I was using was Frdral Gold Match 69-grain HPBT. I called Federal and they kept insisting that it was probably over-pressuring caused by the rifle's tight chamber (or something like that). I tried to tell them that I am not running into such issues with the previous lot.

    Come to find out much later that the actual cause was an error in manufacturing the brass for the cases. It seems the brass for that lot was too soft. I have not bought any Federal ammo since.
    We must not believe the Evil One when he tells us that there is nothing we can do in the face of violence, injustice and sin. - Pope Francis I

Page 3 of 3 FirstFirst 123

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •