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Thread: Converting m12 .204 to .243AI

  1. #1
    Basic Member 87predator's Avatar
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    Converting m12 .204 to .243AI


    Hello gents,
    I have an 243 AI barrel I'm selling to a friend. I've done a few conversions but never this one. I know we will need a new bolt head and baffle. magazine follower. My question is, if I take the spacer out of the magazine will it work, if not, where can I buy a new box. What other parts am I leaving out?

    Converting a M12 fv staggerd feed .204 to a 243 AI.

    Thanks in advance.
    12 LRP .204, 200 .243 project rifle. (action), 116 SS action, 200 270

  2. #2
    Basic Member bootsmcguire's Avatar
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    I think you have got the parts list down. Midway normally handles them. Here's the links for follower and mag box:

    http://www.midwayusa.com/product/427...g-short-action

    http://www.midwayusa.com/product/575...6-short-action

    Looks like both are in stock.
    204, 22 K-Hornet, 222, 223, 22-250, 22-250AI, 6BR, 243, 243AI, 6-06, 6-WSM, 250-3000AI, 270, 7-08, 7RM, 30BR, 308, 30-06, 375 H&H, 444 Marlin, 450BM, 458WM

  3. #3
    Basic Member 87predator's Avatar
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    Thanks boots, I've never removed the magazine, it is staggered feed. how is this done? I've always just used like actions to build in like family of cartridge.
    12 LRP .204, 200 .243 project rifle. (action), 116 SS action, 200 270

  4. #4
    Basic Member bootsmcguire's Avatar
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    there are 2 little tabs that fit into slots in the action and the front and back. I just put a flat screwdriver in and twist it a bit and they pop right out.
    204, 22 K-Hornet, 222, 223, 22-250, 22-250AI, 6BR, 243, 243AI, 6-06, 6-WSM, 250-3000AI, 270, 7-08, 7RM, 30BR, 308, 30-06, 375 H&H, 444 Marlin, 450BM, 458WM

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