I've had a Colt Combat S70 .45acp for a couple years and thoroughly enjoy it. Oddly, with all my years of firearms ownership and experience, I've never had a .38 super. I changed that today, after coming across a few hundred round of ammo. Same gun - stainless Combat S70. While finalizing the transaction, I performed the normal function tests. (Colt certified 1911 armorer for double digit number of years) Later the same day, while dry firing it, the hammer locked up and won't drop. Field stripped it and nothing obvious. Because I'm so frustrated with it failing as a brand new in the box Colt, I'm not inclined to "armorer" the problem out. I think I'll be calling them Monday for a return shipping label on their dime. Sigh....