I bought an ATI Titan (used), and really like the gun. Unfortunately, my Titan, like others I've read about, suffered from a few issues. The most common (it seems) is associated with the recoil spring guide rod, and the way that ATI chose to attach the guide rod back plate to the guide rod (with a screw). The ATI Titan guide rod is on the left in this photo:
Thanks to TomWalshCo (from 1911 forum for the pic and info):
In my case, not only was the guide rod/spring assy a pain to remove, but the back plate cracked. In fact, so too did the guide rod plug (bushing).
I initially contacted ATI, spoke with a helpful/nice Tech, who sent me a few replacement parts. I thought he and I were on the same page during the phone call, but the parts I received were incorrect. I was planning to contact him again, and email him some photos, but I thought, even if I get the right parts, they're probably going to be the same failure prone parts.
Instead, I ordered this from Kimber:
It can be found here:
This includes a guide rod plug that though different in length, still seats/fits perfectly. It's perfectly flush, as it should be, from the muzzle end of the gun, and though it extends a bit further into the slide, it mates with the included Kimber guide rod/spring assy perfectly.
This part addressed three issues for me. The guide rod plug/bushing, the cracked recoil spring back plate, and of course now, there's also no chance of the screw backing out of the guide rod (another issue others have reported).
Yes, I could have persisted with ATI, and I'm quite sure they would have ultimately sent me the correct parts (free, as the gun's with warranty). And, yes, I spent nearly $50 on the Kimber part above. But, it was a plug and play replacement part, and it's of better quality.
Your mileage may vary. I am not encouraging anyone to replace the parts in their ATI Titan, "just because". The gun doesn't run any better with these parts. It works just as it did. The recoil spring tension feels about the same, the slide locks back after the last round, no feed, fire or eject issues. No issues of any kind. But again, if the original parts work, this won't make it any better. If you do decide to go with this part, think carefully before you spend your money. I have no data or long term experience with this part yet, so I don't want to see anyone feel they ordered a part, and got hosed. It works well for me, and I offer this only as a suggestion.
I posted this here, in the event someone does have similar problems, and wants what so far, for me, appears to be a quick, drop-in solution. I've seen other posts that reference the Colt Defender spring/guide rod assy. I haven't tried it, but AFAIK, that part does not include the plug/bushing.