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Thread: DUAL MAC UPPER project (DMAC/RR20)

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    DUAL MAC UPPER project (DMAC/RR20)

    My 12 gauge upper project continues into its third year (so pretty much on schedule) and I grow restless. With all the capabilities Iíve developed on my other project, I felt like making something new- based on something old!

    Next in queue is a dual Mac upper. This went through a few iterations- first as a dual Mac you could shoulder, then something mounted. When the Villar Perosa came up again (via a Forgotten Weapons video) it heavily influenced my design. This is the template for my DMAC Upper, consisting of spade grips, a central disk mount, and front sight. YES, it will accommodate TWO full auto Mac lowers- with 50 round ZMAGs and platform stability the DMAC should be very capable of putting 100 rounds on the steel in about two seconds.

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    Very interesting. I will be following to see your progress.
    Lonnie Gustin - Prattsville, Arkansas

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    Love the creativity! Which Mac do you have in mind?

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    Quote Originally Posted by Gaujo View Post
    Love the creativity! Which Mac do you have in mind?
    Built for M11/9s - Because thatís what I have... though I am making an extra set of the original parts so I can build another or sell as a kit, if anyone would like to build one. Iím trying very hard to try to build this using only plasma cut steel flats. It will allow for lower costs and faster production- and being based on a war time design, it should be engineered for fast & easy production. It should also be easily adaptable for other Mac types but I would NOT recommend mixed pairs of different MACs.
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    Neat... would buy, good luck.

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    I’ve got two M11/9 guns waiting for something like this! And two M11A1s :-)
    Now hosting: www.MAC-11.info

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    I'm thinking two rifle caliber mac uppers personally ;-). You would need the same trigger in both guns I would think. Wouldn't want one to have a different pull weight or breaking point.

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    Quote Originally Posted by Gaujo View Post
    I'm thinking two rifle caliber mac uppers personally ;-). You would need the same trigger in both guns I would think. Wouldn't want one to have a different pull weight or breaking point.
    YES! This is specific to subguns but I would gladly do a rifle caliber version Dual upper, Iíd love to see that!! My current design uses a single spade grip to fire both lowers. I even have a flat side (for synchronized firing) and an offset side (for alternating fire) on the trigger bar. First things first let me build this one, and if anyone else wants one Iíll be happy to work through that process.
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    Here is the initial mock up for the spade grips, built from flats. Part on the far left has been submitted for cutting. Once itís done Iíll verify and submit the remaining parts.

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    Brilliant, wish you pure success! All this will be ATF BS free, recken if someone wants to link 10 guns together they can do so in freedom.

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    Quote Originally Posted by Galil#1 View Post
    Brilliant, wish you pure success! All this will be ATF BS free, recken if someone wants to link 10 guns together they can do so in freedom.
    Amen. As designed (intentionally) there will no ATF determination necessary- and can ship to your Front door, as an unregulated accessory.
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    Wow, I was just thinking about something like that this morning. How to hook up 2 to 4 macs in a mount to all fire at once. I've got 3 - M11a1s.

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    Quote Originally Posted by rsideout View Post
    Wow, I was just thinking about something like that this morning. How to hook up 2 to 4 macs in a mount to all fire at once. I've got 3 - M11a1s.
    It can be done!

    Hopefully picking up first piece tomorrow. Tubing arrived today so I can cut them to length for fitting & welding this weekend.
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    I've got a 3D printer if you'd like easy plastic prototyping.
    Now hosting: www.MAC-11.info

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    Quote Originally Posted by Concorde View Post
    I've got a 3D printer if you'd like easy plastic prototyping.
    Thanks Concorde, I appreciate the offer. At least for this initial one I don’t think it’s needed but noted!
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    Just like that, the first part of the rear grips has been cut. I’ll go pick it up tomorrow. This and the front plate are both necessary to ensuring alignment when welding the tubes & uppers to the mounting disk.
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    Quote Originally Posted by rybread View Post
    I even have a flat side (for synchronized firing) and an offset side (for alternating fire) on the trigger bar.
    I really like that.
    Now hosting: www.MAC-11.info

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    Mount disk cut out. Was larger but cut the diameter down a bit. I use the cut outs to compare to the macs to get the size right before measuring and submitting to be cut.
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    Now a measured drawing. Mount disk & mounting tabs.

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    Interesting concept.

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