I just picked up my first Compact 1911 today and I am very excited. I purchased a Rock Island 1911 Compact for $450. I am very impressed with the pistol and surprised at the same time. I did not expect such a good pistol for the price. The only draw back is that it came with one magazine. I am looking for some more magazines for it but am not sure which mag's it will use. I have seen the Commander and Officer magazines, which is the correct magazine to purchase or can they both be used?