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Thread: Look to build .45 AR-15

  1. #1
    Chinese Connection Bluejack's Avatar
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    Default Look to build .45 AR-15

    Need help to build .45 ACP ar-15, where to find parts , like use cheap easy to find mags


    卡拉希尼可夫突擊步槍

  2. #2
    THE 9mm ADDICT MUSIBIKE's Avatar
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    Do it step by step here.

    There is a fellow selling 80% lowers for that very thing here.

    Some thread over on Weaponsguild had uppers.

    Do it!
    M U S I B I K E

  3. #3
    Gunco Member zgunbear's Avatar
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    Or you could get the Just Right Carbine in .45 acp. It uses either Glock or 1911 magazines. Can be less expensive than building an AR in .45

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    THE 9mm ADDICT MUSIBIKE's Avatar
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    LINK?
    M U S I B I K E

  5. #5
    Gunco Addicted for life j427x's Avatar
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    cheap and easy to find mags? --man your a day late on that one.

    i have considered doing a 45ACP ar-15 carbine for the longest time but i keep getting side tracked.

    you could use tompson or grease gun mags -or possibly UZI 45 mags. open up one of those plastic pro-mag blocks for the bigger mag?? or cut one out of a 0% and make the mag well for the mag your going to run.

    you could do a DI gas and run an opened up 7.62x39 bolt. that would save a lot of buffer weight and still keep reasonable bolt carrier speed.

    Mad machinist is they guy you want to talk to.
    i though about doing a 40 S&W /10mm/ 357 sig the same way

    the 40 is still on the back burner cause i can still get 40 ammo for semi-reasonable money. it would take UZI 9mm mags --but now their scarce and expansive too--


    right now ammo and mags are a problem for about any build--

  6. #6
    THE 9mm ADDICT MUSIBIKE's Avatar
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    The day that has finally rolled around is why I assembled several 9mm AR15s. I have four of them now. When UZI mags were so easy to come by, I machined a pile of them out in the machine shop in the LAB.

    Now these things are something that can make a pistol round act like a rifle round. And, with a bit more capability.

    My capability up to 100 yards is quite good with these things. I don't have to dump my high powered stuff trying to manage close up problems. Most effective power for closer range work like the Germans developed with the MP40. But, a bit better accuracy in an Ar15 structure.

    If I were you, I would look at Rock River Arms. They just might have some 9mm, AR15 parts left to assemble you a proven system?
    M U S I B I K E

  7. #7
    Gunco Member zgunbear's Avatar
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    Here is a link to quite a few pictures:
    Just Right Carbines - Google Search
    Here is the .45 for sale:
    Just Right Carbine 45 ACP
    There are some people online who had feeding issues. If you tweak the magazine springs per Just Rights instructions it feeds great. All you need to do is bend the rear of the top coil up so the follower pushes up more on the rear of the brass.
    http://www.justrightcarbines.com/upl...dification.pdf
    Mine feeds all the .45 ammo I have tried through it from 185 to 230 grain bullets. Round nose, semi wad cutter or flat point all go bang.

  8. #8
    Gunco Regular Rocster's Avatar
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    Here is info on the CNCGunsmithing AR-45 build.
    They used an Olympic Arms upper, and custom lower.
    http://www.cncguns.com/projects/AR45lower.html

    The lower uses Grease gun mags, and is wider than a stock one due to the width of the grease gun double stack mag. Looks awesome.
    The 100% receiver is avail. for $412 (see info at the end of the above link)
    "To invent, you need a good imagination and a pile of junk."
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    Gunco Addicted for life j427x's Avatar
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    you might try to locate mad machinist over at

    Beyond556.com - Beyond556.com

    they still do a lot of pistol cal builds there--

  10. #10
    CEO Macon Armory Inc. Mad-Machinist's Avatar
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    Quote Originally Posted by j427x View Post
    you might try to locate mad machinist over at

    Beyond556.com - Beyond556.com

    they still do a lot of pistol cal builds there--
    Or just give me a shout here.....I mainly hang out at weaponsguild.....but I try and check in here at least once a day......

    And the .45 Promag Uzi mags feed 40 S&W beautifully....just pinch the feed lips in....I make a simple magwell adaptor out of a laser cut flat and a couple of pieces of aluminum.

    I'm also working on a new series of blowback designs......that some of you might find exceptionally cool ......that is all I can say till I have a working prototype to show......

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