I have the HPG Recon, as well as the Snubby Recon. A 4" Ruger GP100 fits in the Recon, but not the Snubby. There is no venting between the bag and your chest if you have it pulled tight to your body, so it does get a bit sweaty in warm weather.

The question isn't who is going to let me; it's who is going to stop me.