Bear in mind that, while an owner of the SR9 pistol (FS I assume means Full Size?) might want the longer mags, some of us who own just the PC carbine are much happier with shorter ones. The capacity is the same, so why have that extra length dangling below the gun? I put the Glock magwell on mine, and specifically look for Glock 19 or, better yet, 26 mags for this reason.
Is it safe to say this here? I know on the Black Rifles forum, surrounded by guys who think they look cool with pinned 30-round mags or even pinned drums, this might not go over well. I hope the PCC crowd is more...discerning...