I have a Marlin .45 Camp Carbine. It comes with a 7 round mag. that also fits in a 1911. They also made a 9mm carbine. I bought the .45 when it first came out. I think they've discontinued it, but I don't know why. Let me tell you, this is one of my favorite guns to shoot. The .45 in a rifle has a very small recoil and I've never had it jam with the original mag. I also bought 3 15 round mags so I didn't have to spend time to reload. I did have a couple of jams with one of the 15 round mags, but otherwise a very fun gun. I remember reading that some police agencies had them because the mag was interchangealbe with the 1911. Also, +P rounds weren't recommended. The Doctor.