+1 on this

I agonized over this when I bought mine years and years ago. For piece of mind, take an unloaded SAO with the safety off and zip it up in the holster compartment. Then see if you can get the hammer to fall with it in the bag. I never could. Over on the HPG forum they describe it as a holster within a holster.

Any of the "FULL" kit bags should have no issue holding a large revolver. They are 11.50 inches wide and 7.50 inches tall.

Thanks. Off to look at options.

I've  carried a 5" 629 in my full recon.

I was looking for a heavy recon.
I put in a notify me on the HPG web page.
I finally got the notification and they were already sold out.
Figuring they'd finally run a batch I started googling and found mine at 5col

I already had a full size recon.
The 5.11 looks decent, but a bit smaller than an HPG full. If I didn't already have HPG, I might go that route.
And it's much cheaper than the HPG, so if you decide to go HPG later, you're not out much.

Which one do you have?
On my recon I ended up adding mag pouches to the front for my phone and compass. Spare mag and truck key and fob in the zipper compartment.
Originally I only bought it to carry the gun.
What I dont like is that there isn't a pistol mag/light size divider in the front pocket. The dividers seem to made for rifle mags. That's why I moved up to the heavy recon.
I put a tactigami mag pouch on the velcro in the holster compartment. Still have room for a big semi auto.
And now I have some more room in the front pockets. Now I can keep everything covered.

I use the HPG smaller chest bag when I run trails with a kydex trigger guard cover tethered in.

Very comfortable setup

Maxpedition has a universal holster which is a velco strap and loop. The strap lays flat against the chest bag and the loop can be sized to go around any pistol you plan to use in your kit bag. I use it and it works great.