XCR-L Won't Load Rounds from Magazine....
Like Tree4Likes
Page 1 of 2 12 LastLast
Results 1 to 10 of 12

Thread: XCR-L Won't Load Rounds from Magazine....

  1. #1
    XCR Guru Sean K.'s Avatar
    Join Date
    Nov 2008
    Location
    AZ
    Posts
    21,391

    XCR-L Won't Load Rounds from Magazine....

    So, bought a used 5.56 pistol with a 10" bbl from a member here...finally took it out and it has some serious problems loading a round from the mag into the chamber.

    Mags were known to be good (and worked in other XCRs with no issues today) Pmags, Hex Mags, GI aluminum mags. Ammo was all IMI 55 grain mil surp....had Brown Bear steel case 55 grain too, but didn't try to load any of it. Didn't think of it until now.

    Basically, the round is fed partially into the chamber but won't close....and can't be extracted/ejected without pogoing the pistol most of the time. When it comes out, the case itself is bent about midway down the case..sometimes severely. I can hand feed one round into the chamber at a time....no issues firing or ejecting. Lower is a 84XX SN. Type 1 bolt & lower, Type 3 gas.

    I reseated the bbl multiple times..thinking it might not be aligned right or not deep enough into the upper receiver. That didn't change anything.

    While I had it out, it *appeared* that the allen screw for the gas block hole is not in line with the divot for the bbl retention bolt. IIRC, the XCR uses a screw on bbl extension....but I can't see any parting line between the bbl and the extension that would indicate that to be the case. In short, it looks as if the extension and therefore, the feed ramps may not be aligned properly with their center at 6 o'clock.

    Am I remembering right?....the XCR bbl extension threads on?

    Any ideas what might be causing this other than an alignment issue of the extension?
    "Necessity is the plea for every infringement of human liberty. It is the argument of tyrants; the creed of slaves."-William Pitt the Younger

  2. #2
    Rifleman owtlaw's Avatar
    Join Date
    Nov 2011
    Posts
    114
    I would check your chamber first. It sounds like something may be stuck inside of it.

  3. #3
    XCR Guru Sean K.'s Avatar
    Join Date
    Nov 2008
    Location
    AZ
    Posts
    21,391
    Quote Originally Posted by owtlaw View Post
    I would check your chamber first. It sounds like something may be stuck inside of it.
    Chamber is good....But....looks like the firing pin is broken...and protruding.
    "Necessity is the plea for every infringement of human liberty. It is the argument of tyrants; the creed of slaves."-William Pitt the Younger

  4. Remove Advertisements
    XCRForum.com
    Advertisements
     

  5. #4
    XCR Guru Sean K.'s Avatar
    Join Date
    Nov 2008
    Location
    AZ
    Posts
    21,391
    Can anyone confirm that the extensions are screwed on?

    Did confirm the bolt has a broken firing pin. Haven't tried chambering with a new bolt yet. Hopefully tonight if I have time.
    "Necessity is the plea for every infringement of human liberty. It is the argument of tyrants; the creed of slaves."-William Pitt the Younger

  6. #5
    Rifleman owtlaw's Avatar
    Join Date
    Nov 2011
    Posts
    114
    Barrel extensions are screwed on. A broken firing pin can cause the problem.
    Sean K. and Merlin like this.

  7. #6
    XCR Guru Carpenter's Avatar
    Join Date
    Aug 2010
    Posts
    1,500
    Im pretty sure i had a broken and jammed forward, (therefore protruding) FP cause similar feeding issues as well. I would bet a new pin and you are G2G.....

    E.T.A found the thread

    https://www.xcrforum.com/forum/29-pr...ns-wanted.html
    Last edited by Carpenter; 10-28-2019 at 08:53 PM. Reason: added info
    Sean K. and Merlin like this.
    hope for the best, prepare for the worst, and make hay while the sun shines!

  8. #7
    XCR Guru Sean K.'s Avatar
    Join Date
    Nov 2008
    Location
    AZ
    Posts
    21,391
    Yep...that was it. Changed to a spare bolt and it's loading/chambering from a mag no issues.

    Now I gotta change the broken pin in the bolt itself.

    Never done that before.

    Do I need to check for the correct chamfer on the bolt face hole? IIRC, that's a really old problem and shouldn't be an issue for a SN in the 84XX range.

    Thanks for the help guys. Had a feeling that was going to be it but your confirmation helped me dial in the diagnosis. Much appreciated.
    "Necessity is the plea for every infringement of human liberty. It is the argument of tyrants; the creed of slaves."-William Pitt the Younger

  9. #8
    XCR Guru Carpenter's Avatar
    Join Date
    Aug 2010
    Posts
    1,500
    Glad that worked for ya, hopefully a snap to swap pins, but still, disconcerning. Your first broken pin? if that is true then thats a little comfort at least because i know you push some rounds through and don't baby them.
    hope for the best, prepare for the worst, and make hay while the sun shines!

  10. #9
    XCR Guru Sean K.'s Avatar
    Join Date
    Nov 2008
    Location
    AZ
    Posts
    21,391
    Quote Originally Posted by Carpenter View Post
    Glad that worked for ya, hopefully a snap to swap pins, but still, disconcerning. Your first broken pin? if that is true then thats a little comfort at least because i know you push some rounds through and don't baby them.
    Yeah...I'm guessing the pin was broken before I got it.

    That begs the question: Was the switch to the Type 2 bolt really a fix for broken firing pins? The official reason was to help negate slam fire potential (which with the break I and Carp had could definitely happen)...and lighten the BCG to reduce weight and recoil mass.

    That leads me to believe the problem isn't necessarily the pins, but more potentially the channel in the bolt itself...as in if the tapered pin binds on the channel or exit hole at the end, it could break.

    This could well be a problem with a specific type 1 bolt...as in, it's out of tolerance from a QC perspective. Could also be the diameter or rate of taper on the pin itself or a combination of the two.

    I think I'll try and keep a round count on the bolt and new firing pin I put in and get a feel for when (if) it breaks. Might also occasionally tear it down to look for wear points.
    "Necessity is the plea for every infringement of human liberty. It is the argument of tyrants; the creed of slaves."-William Pitt the Younger

  11. #10
    XCR Guru Sean K.'s Avatar
    Join Date
    Nov 2008
    Location
    AZ
    Posts
    21,391
    Anyone have pics of the Type 2 firing pin separated from the carrier?

    After looking over the Type 1 firing pin....there is just a poorly engineered stress riser in them. Wondering if the Type 2 redesign was really more about this issue than anything else.

    Mine broke right where the step is built in to go from the smaller diameter pin that then tapers to the much larger diameter where the roll pin goes through the firing pin itself.
    "Necessity is the plea for every infringement of human liberty. It is the argument of tyrants; the creed of slaves."-William Pitt the Younger

Page 1 of 2 12 LastLast

Sponsors

Posting Permissions

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