Grant,
I've owned a Guide Gun for about 6 months now, and I've had more fun with that gun than any other that I can ever remember. $300 for a gun with only 40 rounds through it is a great deal, assuming that the rifle is in nearly new shape.
I really wanted one of the GG's with the non-ported barrel, but I couldn't stand to wait and ended up with one with the ports. I've killed several deer with the gun, and the noise never bothered me. However, I handload, and was not shooting "full power" loads at the deer. The deer didn't seem to notice that the bullet was only moving 1150 fps...
With no alterations, my GG will shoot cloverleaf groups at 50 yards (with a Williams peep sight.)
Many folks like the longer barrells of the CB model, but the short barrelled gun sure is handy in the woods if you hunt! A GG that's 3 years old will have the ported barrell.
Let us know what you decide.
The Blade