6.8 bolt for 5.56?
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  1. #1
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    6.8 bolt for 5.56?

    Okay so I purchased the 6.8 version of the ACR instead of the 5.56 version. My question is can you use the 6.8 bolt to shoot 5.56? If not why? Because I have purchased the 6.8 version I have to go through bushmaster themselves for the 5.56 bolt I haven’t found a barrel/bolt combo for the 5.56. Any info would be appreciated.

  2. #2
    Full Member horseman04's Avatar
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    The 6.8 SPC shell casings are wider than a 5.56 shell casing, so the bolt face is larger to accommodate it. Also, the extractors are typically different as well. You will need to buy both a 5.56 barrel AND a 5.56 bolt to switch your ACR to 5.56. I'd recommend checking with BigDog here on the forum as he can typically get us good pricing on Bushmaster parts.
    Last edited by horseman04; 10-23-2019 at 09:36 PM.

  3. #3
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    Oh okay thank you! I’ve been wondering this for a long time and couldn’t find a legit answer. I appreciate it!

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  5. #4
    Full Member horseman04's Avatar
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    Sure thing! The nice thing about the ACR is that switching back and forth between the calibers is fast and easy.

  6. #5
    Full Member ThunderDan19's Avatar
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    You gotta love it: Shoot 6.8 and enjoy all the benefits of that, but always have the option to easily drop back to 5.56/.223 in a pinch for easier/cheaper access to ammo.

    It took BM finally dropping the 6.8 kit for my ACR to find its way back out of the safe after years of storage. It's crazy that it took this long for them to finally bring this to realization.

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  7. #6
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    6.8 SPC is based off the .30 Remington cartridge and has a rim diameter of 0.422." 5.56 has a rim diameter of 0.378."Rim thickness is slightly different at .049" and 0.045" respectively so they may also use different extractors.

    Dana seems to have a good line on BM factory parts and can probably get your a 5.56 barrel/bolt combo for a good deal. If I were you I'd ask him for a pinned and welded 14.5"

  8. #7
    Full Member ThunderDan19's Avatar
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    I'll second the recommendation for the 14.5" pinned for your 5.56 barrel. Helps get that front end weight down a little.

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  9. #8
    Full Member horseman04's Avatar
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    I'll 3rd that recommendation. Dana (BigDog) pinned and welded my 14.5" 5.56 barrel and it's been great.

  10. #9
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    I’d have to check my parts to be 100% certain, but I think I have a spare 5.56 bolt. If so, I could probably swap you bolts. Of course this would mean that Dana would be building me another barrel! Haha...


 

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