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Big Bore Uppers

chiefr

Thought I would post this tidbit of info for those who have had ejection and or feeding problems with their ARs and AR builds notably 458 SOCOM, 450 Bushmaster, 50 Beo etc.

Make sure you are using a big bore upper receiver. Have seen this problem countless times at the range. In some cases even with newly purchased complete uppers. Big bore uppers are not milspec, they are machined with a larger opening.

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Comments

5 comments

Date Votes
  • Merlinnv12

    What is a BOG BORE UPPER?

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  • dunbarboyz

    Fat finger syndrome.

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  • mohawk600

    love my SOCOM

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  • chiefr
    dunbarboyz: 33165326380699/comments/33165342710427

    Fat finger syndrome.

    Yep, should be BIG BORE. My bad

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  • yoshmyster

    Might as well address the spring and buffer combo to make them run. For my .458 I spend the extra cash for JP Enterprise Tungsten weights (2 tungsten weights) and collection of springs to "tune" it . Adjustable gas block is nice, too.

    Oh I also got one of those detachable pic rail Calwell's brass catcher so I don't have to do much chasing.

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