I have been having some jams with my series 70 Colt Commander. The mag I got with the gun was a Pachmayr with a round follower. I took two of the mags that came with my Springfield Arms Loaded model out to try with my Commander. The Commander never missed a beat...man it was great. The Springfield mags have the flat followers and I was wondering what did the followers look like on the original series 70 Colt?