It depends. How big of a guy are you? If you can conceal a full size 1911 pattern gun well then the little extra length due to the extended mag well probably won't effect concealment. However, you will probably have to use an extended base pad on your mags to use them with the mag well. This will add even more length. I carry a 1911 with a Smith & Alexander magwell (which includes the mainspring housing) and magazines with extended base pads without any problems. But I'm a big guy at 6 ft. and 220 lbs. I've recently got a Kimber Pro CDP and don't intend to bother adding an extended mag well. Having one is great for quick reloads, especially in competition like IPSC or IDPA, but in the real world of concealed cary I wouldn't bother. Kimber has done a nice job of beveling the mag well anyway. If you do decide to get one get the best - A Smith & Alexander.