So, I read that the new Model 10 FCP-SR now has a bottom medal exactly the same as a FCNS. I bought one online for about half what the custom extended mags cost (granted, they can hold a legit 10 rounds, vs the new FCP-SR only holding 9 well). It clamps into the bottom of the rifle well, but when I ran the bolt it had trouble feeding. Has anyone else tried this?