Robert FL wrote:Maybe that is an AR 10 magazine?...OK, I looked around on the web and I see there are 410 shotgun uppers that use an AR 15 lower.. So I would think the 410 mag would fit our lowers. The Hornady 250 grain FTX barely fit in my Stainless magazines.
It would appear, they are for standard lowers, but I'm wondering how? I have a couple stainless mags that I have windowed (cut part of the front out to load longer), and I think I can only load out 2.4". I'll have to double check the length, but still, a shell 2.5" long AND it's a polymer mag.