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Thread: Mid-length upper on a rifle lower?

  1. #21
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    Quote Originally Posted by Todd.K View Post
    It depends on how the gas port was designed. If it's designed for minimal cyclic rate with a carbine buffer the rifle system may cause issues.

    The 14.5" mid length can be reliable with any set up, if it's designed for it.
    I spoke with the folks at Spikes. The upper was designed to be run in a carbine gas tube with an H buffer. They hadn't had any experience with running it on a rifle tube/buffer setup (since most states don't have NJ's retarded gun laws). I think my best bet will be, assuming my current setup has more hiccups than the one yesterday, to get the buffer spacer and run a carbine spring/buffer setup.

  2. #22
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    Quote Originally Posted by markm View Post
    The extra 1.5 is ALL THE DIFFERENCE in the world.

    not even comparible to the 14.5. You need to have every part just right to run a rifle buffer reliablely.

    I just got through changing the gas tube on my 14.5 middy. The part the tube that the gas key slides over was .010" too narrow and it was giving my carbine lock back fits. I could see a lot of carbon fouling on the tube forward of the upper receiver.

    No misfeeds, but almost constant failures to lock back. My 14.5 BCM middy will run a rifle buffer system as long as I'm not losing gas ANYWHERE in the system. It's borderline... and H buffer is optimal.
    So i have had a few more stoppages.
    I just went and ordered a carbine spring and an H buffer. Tonight I will pick up a Spikes buffer spacer from a friend that has a spare. Hopefull this is the magic combination. Thanks for the help.
    Last edited by Lunker; 08-29-12 at 15:07.

  3. #23
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    Quote Originally Posted by Lunker View Post
    So i have had a few more stoppages.
    I just went and ordered a carbine spring and an H buffer. Tonight I will pick up a Spikes buffer spacer from a friend that has a spare. Hopefull this is the magic combination. Thanks for the help.
    It should. Look at your gas tube too. I had a bad one that was leaking gas at the key because it was .010" too thin on the outer diameter...
    "You people have too much time on your hands." - scottryan

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