The capacity on the 1911 isn't a big issue with me but could be considered a weakness by some.
Consider if you knew you had to use one of them, we'll narrow it down to 45acp only, the G21 and a 1911,...and it was coming straight out of the box. No break-in period, no getting to try ammo beforehand, only the mags that came with it, etc... I really have no doubts about the G21 being good to go.
