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Guns should be fun. They dont need to be practical.
The guns I shoot most fall in that category.

I have a Spikes AR lower that I form 1 registered for a SBR and I really want to make it an AR9 SBR.

The mag well adaptor I want is no longer made, which is a big disappointment because it allowed use of un-modified Uzi mags.

I was recently shown an interesting accessory for a Magpul mag that converted it to 9mm. Looked like it ran pretty well in the guy's AR9.

MEAN ARMS
 
As for glock mags and bolt holds, new frontier incorporates that into the upper. They even have a non reciprocating side charging upper with the bolt hold. I run their regular upper, and it holds reliably on glock mags, but not magpul.
 
Optimal barrel length for 9mm if you ask me.

1BwnK3.jpg
 
I started with a Kerry's Guns AR9 and it was an awesome build. Then I bought a CZ Scorpion, and then a Kriss Vector.
While the AR9 was cool, I liked it so much less than the Vector and the Scorpion that it got sold.
 
I love mine a lot but it is a home built but it does not have the last round bolt hold open. It started out as some leftover parts from other projects.

BCM upper receiver
Faxon 8.5 barrel with KAK flash can
Faxon free float for end
New Frontier bolt with Colt firing pin
Kaw Valley 7.5oz buffer and heavy buffer spring
New Frontier billet lower for Glock mags
BCM Enhanced Lower Parts Kit with Mod 3 grip
Shock Wave arm brace with KAK buffer tube

1a9mm.jpg
 
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Last round hold open. MP5 style side charger. Foxtrot Mike makes some good stuff. $500. What's not to like.

If I didn't have a couple I would buy it.
 
Well, I just pulled the trigger on this one.
I've always built, but I couldn't get this one to pencil out if I built it.
Primarily because I want some QC-10 proprietary stuff which kills the budget.
IMO, they have the most developed Colt pattern lower on the market.

Quarter Circle 10
Rider 9mm AR Pistol

QC-10 proprietary lower (Colt pattern)
VLTOR upper (made for QC-10)
Mil spec LPK
SOB brace
Radian Raptor charging handle
7-1/2" QC-10 barrel
QC-10 M-Lok handguard
(1) Metalform Colt pattern 32rd mag

$1347.46 shipped
Courtney gave me a nice discount which was about $230 off of list price.

Here's an image of their 5-1/2" Colt pattern with Keymod handguard. (Mine's 7.5" and M-Lok)
quarter_circle_10_clt9mm_pistol_5.5_inch_right.jpg

Quarter Circle 10 Rider 9mm Pistol

https://www.quartercircle10.com/media/manuals/RIDER MANUAL REV A.4.pdf
 
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