What changes in the XCR-L caliber to caliber?
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Thread: What changes in the XCR-L caliber to caliber?

  1. #1
    Expert crusoe's Avatar
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    What changes in the XCR-L caliber to caliber?

    back to XCR 101 class for me. Does anyone know for each caliber offered, what has to be changed and what stays the same, I.e. Trigger spring, ejection port block, bolt, gas rod spring, etc.? Is there a chart somewhere that I missed?

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    XCR Guru Merlin's Avatar
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    Let me see how I do. Correct me if I am wrong.

    5.56 -> 7.62 = Magazine, Barrel, Bolt, Trigger Spring, Gas Dial and Ejector plastic thingy.
    6.8 = Magazine, Barrel, Bolt, Trigger Spring, Gas Dial and Ejector plastic thingy.
    5.45 = Magazine, Barrel, Bolt, Trigger Spring, Gas Dial and Ejector plastic thingy.
    300 BLK = Barrel, Bolt, Gas Dial.
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    Marksman Hoag's Avatar
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    Here is a link to the 6.8 SPC kit. (Keep in mind that this is a Canadian website, so don't freak out at the price.)

    Wolverine Supplies - Online Gun Store | Product Details | Robinson Armament XCR 6.8 SPC Caliber 18.6" Conversion Kit

    I would imagine that other calibers would be similarly equipped.
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    Expert jro1's Avatar
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    Quote Originally Posted by Merlin View Post
    Let me see how I do. Correct me if I am wrong.

    5.56 -> 7.62 = Magazine, Barrel, Bolt, Trigger Spring, Gas Dial and Ejector plastic thingy.

    6.8 = Magazine, Barrel, Bolt, Trigger Spring, Gas Dial and Ejector plastic thingy.
    5.45 = Magazine, Barrel, Bolt, Trigger Spring, Gas Dial and Ejector plastic thingy.
    300 BLK = Barrel, Bolt, Gas Dial.
    I went from 7.62 to 5.56, and kept the same trigger spring! is that okay?
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    Expert Mechanic's Avatar
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    Quote Originally Posted by Merlin View Post
    Let me see how I do. Correct me if I am wrong.

    5.56 -> 7.62 = Magazine, Barrel, Bolt, Trigger Spring, Gas Dial and Ejector plastic thingy.
    6.8 = Magazine, Barrel, Bolt, Trigger Spring, Gas Dial and Ejector plastic thingy.
    5.45 = Magazine, Barrel, Bolt, Trigger Spring, Gas Dial and Ejector plastic thingy.
    300 BLK = Barrel, Bolt, Gas Dial.
    Do you mean hammer spring? I would think you would only need to change that for the Russian hard primers if you're getting light strikes.
    I'm not sure I would bother with the brass deflector (ejector plastic thingy). Probably would throw more to 3 O'clock on 5.56 using the 7.62 deflector.
    300BLK uses the 5.56 bolt. Rumor is that it uses a gas system that taps the barrel closer to the chamber, so anticipate gas block, op rod, recoil spring assembly as well.
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    Expert Mechanic's Avatar
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    Quote Originally Posted by Hoag View Post
    Here is a link to the 6.8 SPC kit. (Keep in mind that this is a Canadian website, so don't freak out at the price.)
    Ouch!
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  8. #7
    XCR Guru mjorin's Avatar
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    Most people just run the heavier spring and the 7.62x39 brass deflector on both the 5.56 and the 7.62x39, that is if you run both.
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    Expert Mechanic's Avatar
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    Quote Originally Posted by mjorin View Post
    Most people just run the heavier spring and the 7.62x39 brass deflector on both the 5.56 and the 7.62x39, that is if you run both.
    That's what I assumed. I'm designing one that is adjustable and has a QD for a brass catcher. I'm going to have to buy a metal detector to find my brass as it is. The crap is too expensive to let the lawn mower find it.
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    XCR Guru Merlin's Avatar
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    Quote Originally Posted by Mechanic View Post
    Do you mean hammer spring? I would think you would only need to change that for the Russian hard primers if you're getting light strikes.
    I'm not sure I would bother with the brass deflector (ejector plastic thingy). Probably would throw more to 3 O'clock on 5.56 using the 7.62 deflector.
    300BLK uses the 5.56 bolt. Rumor is that it uses a gas system that taps the barrel closer to the chamber, so anticipate gas block, op rod, recoil spring assembly as well.
    Yep. Hammer Spring and the 300 does Not require a new bolt.

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  11. #10
    XCR Guru Merlin's Avatar
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    Quote Originally Posted by mjorin View Post
    Most people just run the heavier spring and the 7.62x39 brass deflector on both the 5.56 and the 7.62x39, that is if you run both.
    That is what I do.
    cjt50 likes this.

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