Off Topic (re: 45 AMT Backup information): WayneinFL,
Mags for the .45 Backup, while not common can be found without too much difficulty. I just picked up another factory mag at a gunshow a couple of weeks ago. Plus, you can find them on line.
Beware - there are a lot of aftermarket mags available for this gun. I took my AMT to the gunshow and tied two aftermarket mags out, just to see if they would fit. NEITHER would fit - a tad too long. Plus the follower was plastic and a different shape. Stick with factory magazines!
Wolf makes a good guide-rod/recoil spring and they have them in stock - I just purchased one and it cost about $12 with shipping. It really makes a difference - highly recomended!
One other think I will tell you about AMT 45 Backup parts. You can find parts for this gun on Gunbroker, etc. I recently purchased a complete parts set for mine. HOWEVER, unknown to me there were two versions of the AMT 45 DAO Backup manufactured. The slides and the barrels are slightly different and will not interchange without some significant modifications. Comparing the two barrels side-by-side, the ramps are significantly different - other than the ramps, the barrels are identical. Comparing the two slides side-by-side, one was made with some kind of firing pin safety plunger and one lacks the firing pin safety plunger. Either slide will easily fit to the frame and appear to operate ok when you rack the slide. The problem is that when you press the tigger, you can't pull it back far enough to release the hammer. I could probably modify the slide enough to make it work, but I don't think there is any way to get the barrel to work.
FWIW, I've been very pleased with this gun for concealed carry. It's well worth taking the time to tune it and get it running 100%. You'll read a lot of complaints about this gun which, IMHO are complete BS. It'll feed hollow points just fine, so long as you are using a good factory magazine and replace the old guide-rod spring with a wolf spring. Some light polishing might help, but I don't think that's really necessary.
All of the other parts seem to be identical - so I'm too dissapointed as I have spares of the firing pin, extractor, ejector, hammer, trigger, springs, etc., and these are the likely parts to need replacing.