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Thread: Sigh. New owner assembled lower for Noveske .300 Upper Being Tempermental

  1. #1
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    Sigh. New owner assembled lower for Noveske .300 Upper Being Tempermental

    Hey guys,

    Picked up and minor league lower and a decent lower parts group. Installed a carbine buffer spring and a decent baseline buffer. First time try out, with Hornady .300 whisper, first couple of rounds fired and ejected. Then, click, no fire. No auto eject. Manually eject a live round. Load a fresh round. Bang. Again no auto ejection, had to manually eject a live round again and insert another round to fire.

    Trying to trouble shoot problem. The buffer spring in the Magpul battle stock is 11 inches long uncompressed. I do have another spring in the drawer in 10.5 inches. Any clues on if I used the wrong buffer spring? Froglubed, 22 degrees F. Wondering if lower lower quality lower parts group trigger/hammer could contribute.

    Really could use some help. The Noveske ran so well on my patrol rifle and I just wanted to build a dedicated lower to avoid swapping the .223 for .300. Thanks.

  2. #2
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    Carbine spring length is 10-11.25" What ammo? Whats the primer look like on the unfired rounds? Who's LPK? Need more info

  3. #3
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    Quote Originally Posted by 870pilot View Post
    Hey guys,

    Picked up and minor league lower and a decent lower parts group. Installed a carbine buffer spring and a decent baseline buffer. First time try out, with Hornady .300 whisper, first couple of rounds fired and ejected. Then, click, no fire. No auto eject. Manually eject a live round. Load a fresh round. Bang. Again no auto ejection, had to manually eject a live round again and insert another round to fire.

    Trying to trouble shoot problem. The buffer spring in the Magpul battle stock is 11 inches long uncompressed. I do have another spring in the drawer in 10.5 inches. Any clues on if I used the wrong buffer spring? Froglubed, 22 degrees F. Wondering if lower lower quality lower parts group trigger/hammer could contribute.

    Really could use some help. The Noveske ran so well on my patrol rifle and I just wanted to build a dedicated lower to avoid swapping the .223 for .300. Thanks.
    Also the underlined part doesn't make sense to me. There was no bang, just a click?

  4. #4
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    Pictures wouldn't hurt.

    If the rifle is not cycling, did the gas block move?

    If the trigger is not resetting, was the disconnector spring installed correctly?

    We need more information here to be able to help

  5. #5
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    Frog lune im 22f would be my guess. I have not had good luck with it in the cold.

  6. #6
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    I can almost guarantee the hammer spring is not full power. Try swapping it out with a different, full power spring. I had the same problem using a JP lightweight hammer spring. I swapped it out for the heavier one and threw away the lighter spring.

  7. #7
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    Thanks in advance guys. As stated in first post, Hornady .300 Whisper Basically a no name LPK. What I'm trying to describe is that the issue is intermittent. I have to manually load a round into the chamber to get the rifle to fire. Sometimes it does fire. Sometines it doesn't. LPK was installed by new armorer. Gas block solid. Dry fire on bench is perfect ie charge handle, pull trigger, hammer falls. Primer strikes on fired cases are solid. Four of the ejected rounds that did not fire have a incredibly light (hard to see) firing pin strike. The lower is a "AR Fifteen" lower from Kent, WA. Could we discuss disconnector spring proper installation?

  8. #8
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    If the disconnector spring is lost the AR becomes a single shot. Pulling that charging handle gets old after awhile

    Shine a light down into the trigger assembly and you should be able to see if the disconnector spring is still seated properly. The spring should seat all the way at the bottom of the trigger assembly and "lock" in to the machined groove.

    The fact that you are getting light primer strikes makes me wonder if there isn't something else wrong with your trigger installation.
    Last edited by LewP; 01-25-14 at 19:15. Reason: grammar

  9. #9
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    im reading that the disconnector should be able to be rocked back and forth, im my case it is
    Last edited by 870pilot; 01-25-14 at 19:31.

  10. #10
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    Is the hammer spring installed correctly? Is it yellow by any chance?

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