In 1987, I bought a Colt Delta Elite. A steady diet of Norma ammo, and within 500 rounds, I had a cracked frame! I returned the entire firearm to Colt, and they replaced the frame. This time, I noticed a hairline crack at the hole where the slide lock entered on the left side of the frame, at around the 200 round count. Another trip to Colt, and another new frame. This time, I sold the handgun to a dealer at a gunshow. Since then, I own a Kimber, a RAI, a Glock 20 and a Glock 40 that has not suffered any issues. I think those original Colt frames just couldn't take the pounding of the early ammo. I sure wish I had kept that Colt though!