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Posted: 12/10/2020 8:14:10 PM EST
I recently came across a MAC 10 45 ACP upper. Is there a way to find just a semi lower to complete the firearm?
Link Posted: 12/11/2020 7:12:37 PM EST
[Last Edit: 12/11/2020 9:17:16 PM EST by Makarov]
Does it have a full-auto Bolt? If so, that would be really dangerous (probably illegal too) to use with a semi-auto lower even if you could find just a semi-auto lower.
Link Posted: 12/12/2020 7:19:34 PM EST
I only have the upper with the barrel installed. No other parts.
The reciever has a HK style dioppler rear sight so I thought it would be cool to try and use it in a build.
Link Posted: 12/12/2020 10:18:21 PM EST
Build one, https://www.ftfindustries.com/
Link Posted: 12/14/2020 1:23:27 PM EST
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Originally Posted By Bayer:
Build one, https://www.ftfindustries.com/
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This, you can buy the flats and bend them yourself.  FTF isn't inexpensive though.
Link Posted: 12/15/2020 5:55:53 AM EST
Link Posted: 12/15/2020 6:59:29 AM EST
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What lower is that?
Link Posted: 12/15/2020 7:01:36 AM EST
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Originally Posted By FLATFOOT762:
What lower is that?
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A 3D printed one.
Link Posted: 12/15/2020 7:13:07 AM EST
[Last Edit: 12/15/2020 7:14:30 AM EST by OTHP]
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Originally Posted By Makarov:
Does it have a full-auto Bolt? If so, that would be really dangerous (probably illegal too) to use with a semi-auto lower even if you could find just a semi-auto lower.
View Quote


Ya so dangerous it won't even work in a semi lower gun since its a fixed firing pin open bolt design.

Eeeeewwwwwww scary machine guns i don't know about so l make up shit.

You can bend a flat weld flats or buy a ffl complete lower or stripped.

Warning semi m10 macs are bricks and not much fun.

If you go 9mm just match a double feed bolt with double feed mags same with single feed 9mm match the bolt to mag.

45 acp it will use US grease gun mags.

Single feed 9mm mags are more reliable and easier to get unless you do. UZI grip stick conversion on it.
But i wouldn't bother with a semi.

With single feed 9mm you have zytel or reconord pam2 conveted mags to choose from.
Double feed mags are hit and miss with reliability unless you do the UZI conversion.

I run the single feed converted sten mags in the Lage Max 10/31 and suomi drums.GG mags in the OEM 45 upper.
Link Posted: 12/15/2020 8:03:31 AM EST
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Originally Posted By DanishM1Garand:

A 3D printed one.
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Originally Posted By DanishM1Garand:
Originally Posted By FLATFOOT762:
What lower is that?

A 3D printed one.


Yep, with AR FCG.
Link Posted: 12/15/2020 8:21:20 AM EST
Serious question, how strong is a 3d printed upper.
Could I make an upper for my registered fa mac lower.
Link Posted: 12/15/2020 2:50:34 PM EST
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Originally Posted By belchfire:
Serious question, how strong is a 3d printed upper.
Could I make an upper for my registered fa mac lower.
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You can buy a metal upper for fairly cheap
Link Posted: 12/15/2020 2:57:54 PM EST
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Originally Posted By belchfire:
Serious question, how strong is a 3d printed upper.
Could I make an upper for my registered fa mac lower.
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The MAC style upper uses a heavy bolt and it's pretty violent (it's blowback operated); a buffer makes a noticeable difference when shooting.  Just based on my completely non-scientific, non-engineering knowledge, I'd guess it wouldn't hold up well. Give it a god though, I'd love to try one on one of those printed lowers (which I'd really, really like to try).
Link Posted: 12/15/2020 3:15:48 PM EST
Is that 3D lower on a 9mm or 45? My sister gave me a printer and I'd love to make a lower. I just have no clue how to do it.
Link Posted: 12/15/2020 3:43:28 PM EST
[Last Edit: 12/15/2020 3:55:22 PM EST by BillythePoet]
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Originally Posted By 243savage:
Is that 3D lower on a 9mm or 45? My sister gave me a printer and I'd love to make a lower. I just have no clue how to do it.
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I think they are glock mag, 9mm. Who knows what all is out there though. I had no clue they existed until I stumbled across a subreddit of guys building crazy 3d printed pistols with AR parts kits.


Eta: i guess the one i posted is using a standard mag. The tutorials i found are glocks.
Link Posted: 12/15/2020 7:49:22 PM EST
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I could be tempted by a MAC like that.   Maybe more so if there were mag options.
Link Posted: 12/15/2020 10:54:03 PM EST
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Originally Posted By jhereg:

I could be tempted by a MAC like that.   Maybe more so if there were mag options.
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It looks like their are a few options there. I'm still trying to figure out the best resources for tutorials. I'm not much of a trial and error guy to be honest. I like letting the crafty people figure out the kinks and I just imitate...
Link Posted: 12/15/2020 11:18:23 PM EST
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Originally Posted By BillythePoet:



It looks like their are a few options there. I'm still trying to figure out the best resources for tutorials. I'm not much of a trial and error guy to be honest. I like letting the crafty people figure out the kinks and I just imitate...
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Originally Posted By BillythePoet:
Originally Posted By jhereg:

I could be tempted by a MAC like that.   Maybe more so if there were mag options.



It looks like their are a few options there. I'm still trying to figure out the best resources for tutorials. I'm not much of a trial and error guy to be honest. I like letting the crafty people figure out the kinks and I just imitate...
I've got Glock mags, Colt 9mm AR mags, and mags for my AR-V.  I'd really prefer not to go to another mag to stock.  lol
Link Posted: 12/18/2020 9:44:22 AM EST
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Originally Posted By jhereg:
I've got Glock mags, Colt 9mm AR mags, and mags for my AR-V.  I'd really prefer not to go to another mag to stock.  lol
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Attachment Attached File


Did someone say Glock Mags?

Full disclosure: All of these 3dbois are for semi Mac11 uppers, which of course only work with single feed mags, so your Colt and AR-V/Scorp mags are out. But Sten and Glock mag designs are both available...
Link Posted: 12/18/2020 10:09:09 AM EST
I really need a 3D printer.
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