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The Specs are completely different (and better IMO) on the MOE version so they are 2 diff mags every way!
The M3 is much broader at the top and if you have an in-spec magwell, it can take some working to get it to fit.
I'm sure they AK's with sloppy magwells in mind when making it wider (being so many people have "Out of Spec" magwells VS "Tight/In Spec" Magwells) so if you have a sloppy magwell, the M3 should fit rock solid!!!
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How many M3s do you have? I have several and the M3 is identical to the MOE, are not completely different, and are not 2 different mags in every way.
The M3 is not "much" broader at the top. All the M3s I have fit tight and have slight scruffing on the shoulder just behind the bottleneck in my WASR and fit just perfect in my Sig 556Xi R. The M3s don't take some working to get them to fit. A couple insert/reinsert s have made mine perfect fits in my WASR.
I just measured the two mags for width just below the feed lips.
Magpul MOE: 1.020"
Magpul M3: 1.028"
The only visual differences between the two versions are:
#1 - The MOE has a 3-ribbed slope just below the rear locking lug vs. a solid slope on the M3.
#2 - The MOE doesn't have the partial witness holes on the belly of the magazine like the M3 has.
#3 - The obvious identification moldings between the two versions.
I have posted my finding here.
First Impressions
So your claims are unfounded.