[ Dean knows how strong Cas is, despite all the...comments he might have once thrown at the angel -- and still probably will in the future. The smile only strengthens his as his eyes fall down to the gun which he turns over in curiosity. ]

Colt, yeah - [ He'd thought about it. ] Used to believe in that gun a little more until we found out there are creatures which even its bullets can't kill. At least this darlin' right here is trustworthy to help along on the job.