Sadly, the Dawson by Metalform 1911 magazines are no longer available. So, here's what I supply with my 1911 builds. Realiable and reasonably priced. And, Dawson makes an aluminum wedge basepad that fits in the IPSC box for these magazines, so it's a near perfect replacement.
Wilson Combat 1911 Elite Tactical Magazine
10 Round Full Size 9mm Magazine.
ETM Base Pad