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Thread: Magpul coupler question

  1. #1
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    Magpul coupler question

    Just grabbed a couple Magpul couplers the moment they came back in stock, after waiting quite awhile. I'm just trying to figure something out, and hoping to get some answers from people who actually touch grass. My health has been absolutely shot ever since the pandemic (incredibly long story, but basically, I had not 1, but 2 strokes because of the vaccine), so I'm not likely to be able to just hit the range and try things out, not for awhile. But I can at least handle limited shooting on a square range, with frequent breaks. And things are very slowly improving.

    Anyway.






    Hopefully the images show up. Basically, I always see people using the configuration on the left (pics 2 and 3), with staggered mags, and I'm really not sure why. Other than, that's what the instruction sheet says to do with a pair of 30s. But the configuration on the right makes way more sense to me. With the 30 in the rifle, the 40 doesn't hit or interfere with anything. I guess it blocks access to the quick-release knob on my optic mount, but that's beyond trivial. So, the left configuration adds an inch of height to the rifle when the 30 is loaded, why exactly? I know a pair of 30s has to be staggered for ejection port clearance, but that's a non-issue here. A 30+40 can be even shorter than 2x30 if done my way, so why have I never seen it? I've either figured out a smart solution, or I'm missing something that I'm not going to be able to figure out without doing some actual drilling. Or people are doing it, and I haven't met them.

    Also, I hope it's not too rude to just nip this one in the bud (or try; at least I'll know who actually read the whole thing this way), but I have less than zero interest in the "mag couplers are too heavy and slow, they add weight to the gun, you need to keep a dust cover on one mag, just do everything my way" discussion. You have no idea how many people think "good advice" is something that essentially boils down to "just pretend you're healthy, pretend you never had 2 strokes, do everything my way, and things will be easier!" My priorities and abilities are obviously going to be very different from everyone else's. In this case, the idea is being able to have a rifle and 70 rounds that I can just grab in one hand (leaving the other hand free to support myself with, especially when I have to deal with stairs) and hobble out of my house with, buck naked if I really have to. 90 rounds, even, if I can figure out a non-stupid way to attach the coupled mags to either the rifle or the sling. I deliberately made sure that there's a 20 round mag in every photo, because that's the mag that's lived in the rifle 99.99% of the time until now. I don't care if I have to hook the magazine covers on the the trigger guard before loading them (that's what I practice, anyway). I care about not needing to put on a freaking battle belt or bandolier or molle vest or whatever, just to have more than a single mag on tap. And I don't want to find out the hard way that there's a gigantic downside to having the baseplates flush with each other, if that day ever comes.

    So, yeah, I'm hoping someone who actually touches grass on the regular can offer some insight into why seemingly everyone who runs a 30+40 chooses to stagger them, and whether flush baseplates is a genuinely better idea.
    Last edited by Arrkhal; 05-23-24 at 18:43.

  2. #2
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    You actually touched on it. Some configs block bolt hold open and other ambi setups.

    But if YOU can get to everything you need to do, then your configuration works for you.

    Keep in mind most firearms that use mag couples like SIGs and HKs have paddle mag releases so it's a non issue. With ARs you just have to think about it.
    It's hard to be a ACLU hating, philosophically Libertarian, socially liberal, fiscally conservative, scientifically grounded, agnostic, porn admiring gun owner who believes in self determination.

    Chuck, we miss ya man.

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  3. #3
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    What about the magpul D60? It’s 10 less rounds, but you don’t have to worry about it blocking anything and there’s no mag change involved.

  4. #4
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    I don't run the 40, but I've run 2 30's with no stagger/offset. No issues.
    "What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v

  5. #5
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    Thanks for the replies, guys! Also, I cannot wait for the website upgrade to happen. This is as slow as lazy dirt, and the website just crashed and lost my entire post. Now I have to retype the whole thing. Thanks, Obama.

    You actually touched on it. Some configs block bolt hold open and other ambi setups.
    I'm already planning on making my next AR fully ambi (after going almost a year without 100% function in my right hand), so I will definitely try to remember that! Interference with ambi controls didn't even cross my mind.


    What about the magpul D60?
    I definitely did think about it. I do consider that a viable option. Mostly comes down to cost, I guess. Even though I bought a couple 40s specifically for this (not sure if I have much use for them otherwise), the cost still came out to about half the cost of 1 drum. And I'm a firm believer in the "2 is 1, 1 is none" philosophy, so 2 drums is definitely outside my budget. But I absolutely have enough confidence in the product to try D60s. The only drum mags I've ever owned were a couple Soviet surplus RPK drums, which appear to operate almost identically, and those things were tanks. Dropped, stepped on, kicked. Fully loaded, partial, empty. Never a hint of a problem.


    I don't run the 40, but I've run 2 30's with no stagger/offset. No issues.
    I ended up running into 2 issues with a pair of 30s perfectly side by side. Which may only be cosmetic issues, but it was enough for me to buy a couple 40s.


    Starting out with the left mag, and the rifle dust cover closed, results in this. On the other hand, even with a dust cover on the right mag, doing a function test with dummy rounds still works. The dummies only fly about half as far after bouncing off the dust cover, but they clear the port just fine. It took me about 2 years before I could reliably remember which direction to turn the key in my front door, so I don't really consider "always start with the right mag" to be a solution. If it's even that big of a problem. I'd think the very first mag, with the dust cover having just been closed moments ago, is when the chance of malfunctions is the lowest. Still, it looks weird and I don't like it!


    Very hard to see, but when the dust cover is open, it scratches up the right mag. This is probably a cosmetic issue and nothing more, but I just don't like it on general principles. If parts aren't meant to touch, they shouldn't touch, I don't know.


    I inserted and ejected a brand new mag a few times, and it's definitely gouging out a tiny divot. Only way to photograph it is to use a flashlight to get the shadow. Almost definitely just a cosmetic issue. Still, it makes me feel funny and I don't like it, and if mommy and daddy hadn't been such negligent pieces of utter garbage, they'd have told me that's a good enough reason to not do something! [/s] Seriously, though, their reaction to their only child having 2 massive strokes was to stop talking to me and cut all contact. I haven't heard a single word from them since. Completely in character for them.

    Anyway, I can't help but feel like something might get damaged (probably just the dust cover) if I faceplant on top of the rifle while the left mag is in, with this config. I really figure this is why Magpul's instructions say to stagger a pair of 30s.
    Last edited by Arrkhal; 05-25-24 at 09:33.

  6. #6
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    One concern with the D60 is its mechanism weight. If you have more use of your left hand, maybe start learning southpaw? (I'm a lefty, and usually thumb the mag catch and spear-hand the bolt paddle with my fingertip.)

    Never had a stroke, but it took quite a few years longer than normal and an intensive "improvised physical therapy" regimen to wring useful function out of my right hand, so I can relate to the challenges you're enduring. Stay strong, and never give up!
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  7. #7
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    One concern with the D60 is its mechanism weight. If you have more use of your left hand, maybe start learning southpaw?
    Weight is another big one. I've lost a lot more strength than I want to admit or even think about. I'm pretty sure a grown-ass, 5' 8" man is supposed to weigh more than 115 goddamn pounds! But, very fortunately, I've regained all motor function other than my ability to use chopsticks. Just the one thing, it's bizarre. I just hope my overall health improves enough to start exercising again. As soon as possible. Then again, maybe I'm losing the weight because I can't use chopsticks anymore!

    I should actually make a post over in Technical, too, asking just what the lightest possible build is without sacrificing reliability, given the current state of the art.

    Also, in a fortuitous coincidence, I found a really good deal on 2 D60s that are still brand new, that were basically half price! Looks like I get to experiment a bit once they get here, maybe I'll figure out something worth sharing.

    I appreciate the positive vibes, too, thanks! It has been a long, hard road, but I guarantee you that death will have a fight he'll never forget, when he finally comes for real.

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