I had purchased the double magazine holsters from the shop because these were out of stock, but when I put the +6 dart mag extenders on the 15round Talon mags, the velcro BARELY closed. These fit like they were made to hold mags with extenders installed! I also had the extenders snag on the stitching of the double holster - where these do not have that problem. I think it is because the pockets on these have a slightly larger diameter, so the mag is not as tight (although not loose enough to wobble). I love them!