I've stuck a single G36 mag in my double M4 mag pouch, it always gets snagged on the elastic because of the tabs. Breaking/Sanding off the tabs isn't a bad idea if you don't mind not being able clamping 2 together.
"Hey I'm the first one to say its a great country but its a straaaaange culture. This is a place where gun store owners are given a list of stolen credit cards but not a list of CRIMINALS and MANIACS. And now they're thinking of banning toy guns...AND THEY'RE GONNA KEEP THE F**KING REAL ONES!"
-George Carlin 1937 - 2008 (RIP buddy)