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  1. Yes, religiously.

    Yes, religiously.
  2. I think we have the winner: I put the barrel on...

    I think we have the winner: I put the barrel on my other XCR-L upper and it produced the decent groups shown here.

    Note that it didn't seem to make a difference to accuracy on either upper whether...
  3. No, if I asked for a test that probably would...

    No, if I asked for a test that probably would have pushed delivery back 5 months ;)

    I just got the barrel made, but I do have other XCR uppers I could try.



    Good idea. I'm also going to...
  4. Wondering how much more accuracy I could get I...

    Wondering how much more accuracy I could get I sent a stainless 1:8 Lothar-Walther blank to Robinson. It took them 7 months to turn it into a heavy-contour 11" 5.56mm barrel. I finally got it back...
  5. Further reference points: I fired the same XCR...

    Further reference points: I fired the same XCR upper but with its original 16" light barrel. It liked 55gr ammo, but everything else shot so poorly I didn't even bother marking the targets. Not...
  6. It sort of is: the Savage has a 24" barrel, and...

    It sort of is: the Savage has a 24" barrel, and the XCR Velocity was measured from the 11" barrel. Even if the 11" had a 1:9 twist (instead of the 1:7 used to calculate the stability in the table)...
  7. No, the only thing that should go up as barrel...

    No, the only thing that should go up as barrel length increases is muzzle velocity. (If anything, and holding all else constant, accuracy should degrade because longer barrels are more sensitive to...
  8. This is a 1-7 twist barrel. I always check JBM -...

    This is a 1-7 twist barrel. I always check JBM - Calculations - Stability to confirm stability. For a given caliber the required spin speed is mostly a function of bullet length and weight. (And...
  9. Longer barrels impart speed, not accuracy...

    Longer barrels impart speed, not accuracy (assuming the minimum rotational velocity to spin stabilize the bullet is achieved). If anything it's harder/heavier to cut and keep a longer barrel...
  10. If you're impressed with those, here is a good...

    If you're impressed with those, here is a good baseline: I fired all the ammo through my Savage 10FP, 24" 1:9 barrel. Targets below. I also shot Black Hills, the most accurate, through the Ruger...
  11. Still waiting for Black Hills. But meanwhile I...

    Still waiting for Black Hills. But meanwhile I tested the other ammo through my stock Ruger SR-556 (which is a piston AR). "ATC" (i.e., mean radius) of 10-round groups:

    Wolf Classic 55gr:...
  12. "MAX" is the "extreme spread" (ES) and that seems...

    "MAX" is the "extreme spread" (ES) and that seems to be the most common way of measuring groups: It's just the largest distance between any two shots. The problem is that the expected value of ES...
  13. Certainly. I should have mentioned each barrel...

    Certainly. I should have mentioned each barrel was fixed in a separate upper and before shooting the tests I loosened and then torqued as specified with a calibrated wrench.
  14. Is this reasonable accuracy from the .223 11" barrel?

    I have two short-barrel XCR-Ls, and I've never been happy with their shooting precision. I got access to a machine clamp that holds the gun by the sight rail (thus taking the shooter out of the...
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    Don't bother with NiB for any action parts. ...

    Don't bother with NiB for any action parts. After spending some time with it on mine I regret not doing NP3. NiB isn't as slick, and it gets stained with carbon on first use. And nothing...
  16. Sticky: On topic question: Is there a way to recover all...

    On topic question: Is there a way to recover all my thread subscriptions, or at least a list of them so I can resubscribe by hand?
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    Re: ID'ing Multiple Bolts

    Yeah, RA Tech acknowledged they should engrave or stamp them, but no mention of where that is on the list.

    At least it's clear when you accidentally put a 5.56 on a 7.62, since it won't chamber a...
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    Re: ID'ing Multiple Bolts

    Just got the following specs from RA:
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    Re: ID'ing Multiple Bolts

    I took photos of the two extractors side-by-side:

    5.56 on the left, 7.62x39 on the right

    http://emptormaven.com/img/XCR_Extractors1.jpg

    http://emptormaven.com/img/XCR_Extractors2.jpg
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    Re: ID'ing Multiple Bolts

    If you've ever disassembled the bolts beware: I sent some bolts in for coating and it looks like they swapped the extractors on reassembly. With a 5.56 extractor you can fit a 7.62x39 case into the...
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    Re: NP3 or NiB coating

    Wow, that's unique! Thanks for sharing.

    Any reason you didn't have the gas tube coated?
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    Re: NP3 or NiB coating

    Upper and lower NiB coated? Can you share any pics?
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    Re: NP3 or NiB coating

    NP3 is nickel-teflon, best done by Robar. NiB is nickel-boron, best done by WMD. NiB is harder than NP3.
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    NP3 or NiB coating

    Has anyone had XCR parts coated in NP3 or NiB?

    If so which parts, and have you had any problems?

    I'm planning to coat the

    Gas valve
    Gas tube
    Recoil spring guide
    Bolt carrier
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    Re: XCR owner manual

    Also thanks to whoever provided it, Armorer's Manual is now here: http://emptormaven.com/img/XCR-Armorer-Course.pdf
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