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Thread: .300 AAC BLK/ .300 whisper SL8

  1. #1
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    Default .300 AAC BLK/ .300 whisper SL8

    Now that there is approved commercial ammo source, what is involved in converting a regular SL8 .223 to .300? The idea of the .300 AAC BLK is to use the same mag and bolt head as the 223. HK had a prototype SL9SD, anyone have an idea of what was done to it.

    .300 AAC BLK = 7.62x35

    So what needs to be done to the gun?

    1) have a new barrel made in 300 AAC BLK (obvious)
    2) change the hole size for the gas system? (to what?)
    3) ?

    Here is a link to the 300 BLK site:
    http://300aacblackout.com/

    Last edited by CNADNSL8-5; 12-28-2010 at 09:37 PM.
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    Default

    This I am interested in :) Tagged for info

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    Perhaps a stiffer recoil spring. The gas system being somewhat self-regulating, I would assume that the gas hole would be the same size. I'm sure somewhere there's data on the amount of pressure each caliber produces in the barrel so with that, you could probably determine.
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    Lightbulb

    Any of our HK Gun Gurus have an estimated cost to do something like this??

    Sounds interesting>>>>>

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    Quote Originally Posted by NewbieHKguy View Post
    Any of our HK Gun Gurus have an estimated cost to do something like this??

    Sounds interesting>>>>>
    For starters, the cost of a barrel. Anyone know where to get a 20" heavy bull-barrel off the shelf?

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    Quote Originally Posted by Chopstix Kid View Post
    For starters, the cost of a barrel. Anyone know where to get a 20" heavy bull-barrel off the shelf?
    Yes...

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    Would you also need a mag that fits the whisper and fits into a G36 or AR magwell?

    What else shoots 300 whisper that we could scavenge parts from?

    A seven six two SL8? That would be a dream come true!!

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    OK, apparently they do make AR mags for these so all you need is an AR magwell.

    The other problem is even if you convert an SL8 bbl you will lose the chrome lining. Is that a major problem?

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    Quote Originally Posted by seven.sixtwo View Post
    Would you also need a mag that fits the whisper and fits into a G36 or AR magwell?

    What else shoots 300 whisper that we could scavenge parts from?

    A seven six two SL8? That would be a dream come true!!
    From what I understand, the 300 AAC BLK caliber is able to be used in a standard 223 magazine.

  10. #10
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    Quote Originally Posted by seven.sixtwo View Post
    OK, apparently they do make AR mags for these so all you need is an AR magwell.

    The other problem is even if you convert an SL8 bbl you will lose the chrome lining. Is that a major problem?
    I would think that a brand new .30 cal barrel blank would be better than converting an SL8 barrel. That way you can convert between the 2 calibers.
    Last edited by CNADNSL8-5; 12-28-2010 at 09:30 PM.

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