Glock Talk banner
  • Notice image

    Glocktalk is a forum community dedicated to Glock enthusiasts. Come join the discussion about Glock pistols and rifles, optics, hunting, gunsmithing, styles, reviews, accessories, and more!

Anyone use a quarter circle 10 9mm?

4.3K views 17 replies 9 participants last post by  Hef  
#1 ·
A local gunstore that specializes in ar15s has these and some build kits. Little 9mm braced pistol, uses mp5 mags, Mostly AR ergos but a superior and easy to use side charge. Never heard of them before though. Are they reliable, is recoil impulse good as many ar9s are heavy kicking and gassy. Thoughts?
 
#2 ·
They make the AR lowers that PSA sells as their AR-9. I would get one of the ones that uses Glock mags - certainly a lot more plentiful, cheaper and probably more durable than MP5 mags.

No way in hell I would buy either (a) a ridiculous 9mm pistol built on an AR receiver - seriously, what possible point can that have? or (b) a 9mm than needs MP5 mjagazines, when the same gun can be had that uses Glock mags.
 
#3 ·
I had never heard of them so I looked them up. It appears they make some that accept Glock mags instead of MP5. I personally have less than no use for such a weapon, but one that uses Glock mags at least makes more sense than one that takes MP5 mags. To each their own, of course, but I can’t see why it needs to exist.
 
#4 ·
I built my AR9 on a QC lower (Gibbz Arms side charging upper), good quality, love it. I would happily buy more of their lowers.

Image
 
  • Like
Reactions: Dave514
#7 ·
Dunno, maybe because HK mags are bullet proof

I’ve ran Colt SMG mags in 9mm ARs for over 20 years. I’m still running most of all the mags I originally bought. I do have one that just won’t lock the bolt back. It think that one is a RRA
 
#10 · (Edited)
Never used them but heard and read many good things. Plenty of “what should I buy” AR9 posts with “Just get a QC10 and be done with it” responses.

Also 2nd someone else’s FMproducts recommendation. They have their assembly hiccups like every other volume
manufacturer but customer service is 1st rate and they use quality materials. Very happy with their 16” upper.
 
#11 ·
If you’ve never heard of QC10, you have completely ignored the PCC movement over the last decade.

QC10 is the company that picked up the pieces of the defunct DDLES company. The owner was stripped of all rights to the receiver design and was outed over embezzlement.

QC10 was the main company pushing the Glock mag design.

If configured correctly, as in buffer and spring, it’s a soft push type of recoil, and it’s not gassy.
Many people build guns these days with crap Chinese parts and poor instruction.
 
#12 · (Edited)
If you’ve never heard of QC10, you have completely ignored the PCC movement over the last decade.

QC10 is the company that picked up the pieces of the defunct DDLES company. The owner was stripped of all rights to the receiver design and was outed over embezzlement.

QC10 was the main company pushing the Glock mag design.

If configured correctly, as in buffer and spring, it’s a soft push type of recoil, and it’s not gassy.
Many people build guns these days with crap Chinese parts and poor instruction.
This right here ^^^

I think that Quarter Circle 10 and Angstadt Arms are the two premier AR platform pistol caliber carbine manufacturers in the USA.
Designed from the ground up for pistol cartridges, no adapted parts.

Angstadt if you like Glock pattern and QC10 if you want more options.
Personally, I don't like the mag at the "Glock grip angle" (purely aesthetic) so I got the Colt pattern which uses a modified Uzi mag that is 90 degrees to the receiver.
No mag cost penalty, about the same cost as the Glock 33rd. Metalform and Brownell's are both reliable mags in my QC 10 Colt pattern.
My QC-10 did not like C-Products Defense mags.