A picture (well... 4 really) is worth a lot of words.
I carry the CW45 -
I've been on a small quest of finding a decent single mag carrier.
All the ones I've tried either slide around on my belt (Wilderness Tactical 5 stitch) or protrude too much or are just too uncomfortable and poke/stick/pinch .....
And then last week, I have no idea why it popped in to my head... but my final solution:
http://i6.photobucket.com/albums/y23...psrcsibvj2.jpg
http://i6.photobucket.com/albums/y23...psdf9g5huf.jpg
http://i6.photobucket.com/albums/y23...psk5ium42h.jpg
http://i6.photobucket.com/albums/y23...psail4wljr.jpg
...and Amazon/eBay/surplus stores have the Leatherman (or similar) pouches for ~$8 compared specific purpose mag carriers that start at $35 and go up from that.
With the added bonus that the sheep don't get scared if they see a Leatherman sheath.
Soft, rounded corners, no hard bits and works on the belt real well.