Pretty neat, DT has designed a higher reliability, more compact Quad-Stack magazine for the AR15, that holds 53rd in the length of a 30rd PMAG:

It works by having a custom lower receiver that replaces the standard STANAG lower with a extra wide Quad stack magwell. This lower is compatible with all/most factory M4 / 416 etc lowers, so in theory any rifle in the AR family could be converted to the Quad lifestyle.

Full video here, hopefully a non-fb link will come soon:

YouTube

New product announcement 2022: Quattro-15, Quadmag53, Trek22

Desert Tech is proud to share our newest products for 2022, the Quattro-15, and the Quadmag 53, and the Trek 22. Check our website for more information.

https://deserttech.com/quattro-15.php

YouTube

Desert Tech Quattro-15

InRange is entirely viewer supported:https://www.patreon.com/inrangetvOriginally designed with the NGW project in mind, @Desert Tech has created a new quad ...

Now, I'm not sure if we'll see much use for the Quattro 15 its self. But if it does work well, I could see future rifles in future calibers developed using this system, or see Automatic Rifles like the Ultimax etc developed around a Quad stack optimized magwell. 

another marketing gimmick, IMHO

no quad-stack could be as reliable as a classic double-stack magazine, and you are losing compatibility with your existing magazine stocks

I can understand when you have a quad-stack in your rifle for initial contact, and a bunch of much more reliable 30-rounders in your pouches. But getting only 4-stacks is a bad idea, IMO

also, anyone who loaded any 4-stacker needs steel fingers or a dedicated mag loaders - take it from a guy who has only two quad-stacks for his go-to rifle, and about twenty classic 30- and 45-roundres.

But, since the Quadmag53 is not as tall as a 30-round magazine, you get increased mobility.

And, since 4 Quadmags hold two more rounds than 7 30-round mags, you get to shoot more.

0.05 inch of heights is not 'increasing mobility'. And 'more shooting' with less reliability is acceptable only for plinkers

Russians invested quite a lot into development of 4-stack magazines, and our 60-rounders are far superior to anything else I saw, but even those have serious issues when handled roughly, as happens more often than not in the field.

I think the theory here is that it’s a dedicated quad stack magwell, so lacks the hard transition from 4 to 2 collumns found in many other quad mags, so hopefully will be more reliable.

Whether that actually works remains to be seen, but it’s interesting.

gatnerd said:

so lacks the hard transition from 4 to 2 collumns found in many other quad mags, so hopefully will be more reliable

you still need that transition to feed from 2 rows, so it wouldn't be any better than Russian AK-74 4-stack mags, IMHO

gatnerd said:

Whether that actually works remains to be seen, but it’s interesting.

I agree, it is interesting.  And just because the Russians can't make a reliable quad-stack, doesn't necessarily mean the Quadmag53 also lacks sufficient reliability.  I'd rather wait and see the results of impartial testing.

That being said, I am more than a little skeptical, considering the false and misleading claims made by Desert Tech.  Being a mere 0.06" shorter will not give the shooter "more mobility" than standard 30-rounders.  And, although 212 rounds is technically "more shooting" than 210 rounds, the difference is far too small to be noticeable, whether in combat or plinking at tin cans.

P.S.  Note the comment @ 1:43 in https://youtu.be/Dfsvmgx2pug?t=102  "With the...Desert Tech NGSW military submission..."  What NGSW candidate used the DT Quadmag?

4 vs 7 seems kind of an odd comparison to me - that's one in the gun plus three ammo pouches.

I'm under the impression that four pouches is a more common loadout, so it seems 5*53=265 vs 9*30=270 would be more reasonable?

The lower also comes with an adapter block you can insert to still use normal stanag mags. They show it in the video

stancrist said:

What NGSW candidate used the DT Quadmag?

I don't know if there is a relationship, but the GD RM277 used some elements of DT MDRx... but they could also refer to their NGSAR submission with the PCP .270 WSM round.