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Thank you!! It should be fun to play around with. The SR-25 mags are traditionally double stack with 308, but realistically with the diameter of the 7mm SAUM case, it becomes a single stack. They're 20 rd mags, so I'm not 100% sure what the actual case capacity will be with the 7mm SAUM yet. The follower may or may not need some adjustment, but its a plastic follower, so I'm going to have to be really sure about where material needs removing before I start grinding at the follower. I don't [I]anticipate[I] feeding problems from the mag, but maybe I'm just being hopeful haha!
The good thing is, I'm not the first to take on this project. In fact, maybe 10 or more years ago, DPMS actually made a 7mm SAUM upper. I think lack of sales, and lack of available factory ammo killed the product. Someone might know better than me, but I'm fairly certain they used steel 308 mags. I'll update when I can finally get out and shoot.
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