MARCK 15 in .300 BLK

Marck 15 300 Blackout

MGI is now making the MARCK 15 chambered for the .300 BLK cartridge.  Complete guns and caliber conversion kits are both available.  The rifle carries an MSRP of $1,299 and the kit is $555.

This gun is part of the MARCK 15 line of modular rifles made by MGI.  The guns are designed so that the user can easily swap barrels, bolts and magwells to change the rifle caliber to one of several choices.  Other calibers available include 5.56, 7.62×39, .308, .22 LR, .40 S&W and 9mm.

A .45 ACP version in action:

Richard Johnson

An advocate of gun proliferation zones, Richard is a long time shooter, former cop and internet entrepreneur. Among the many places he calls home is


  • wvjones

    they really did caliber conversion the right way. The review MAC did on the 7.62×39 conversion was awesome.

  • iksnilol

    An interesting/innovative AR? That also can use AK mags in 7.62×39?

    I don’t know what to say.

    I nice for people who don’t/can’t register many guns yet wan’t to try different calibers and the like. I kinda wan’t one, but I am an AK guy. What to do?

  • G

    A: If one were to make ammunition or firearms for 300 AAC BLACKOUT, how must the product be marked?

    SAAMI markings must be used. The actual cartridge name is 300 AAC
    BLACKOUT or 300 AAC Blackout. Notice there is no “.” before the 300
    (SAAMI cartridges do not begin with a decimal). The official SAAMI short
    name is 300 BLK. 300 Blackout and 300 AAC are not allowed.

  • Richard Flood

    Can’t wait for the .45 conversion! This gun is awesome BTW.

  • Michael

    I can count on one hand the number of boxes of 300 blackout I have seen.
    I have seen more guns than ammo.