[GrandEagle]

Would you happen to know why a Springfield Mil-Spec Light Weight would fail to fire the last round?
Don't have any idea on this one? Was the round fully chambered? If you had a faulty mag (either in design or function) it could cause the last round not to chamber fully.

It would also fail to lock back after firing the last round.
The most likely suspect for this one is either a faulty mag or (forgive my lack of a technically accurate word for this piece), the little pin gadget on the slide that detects an empty mag.

Sometimes you just get a faulty firearm too. The last one I bought was a "Rock Island Armory". A fairly inexpensive firearm (around $350.00) that I could carry without worrying about taking a huge loss if it got stolen. The thing is made in the Philippines and is supposed to be a Springfield lower with an old left over G.I. slide. Seemed like a good idea.
Turned out to be the worse sidearm I've ever purchased. Won't fire a single mag without failing to fully load at least one of the rounds. Not sure what I'm going to do with it.
I've got 3 other .45's. A Colt Officers model (Series 80), a Colt 1911 A1, and a Springfield 1911 A1 stainless. All of these have fired many rounds flawlessly with only one exception. I had one bad mag that caused the same problem you had with the slide not locking back after the last shot.

[archy]

Turned out to be the worse sidearm I've ever purchased. Won't fire a single mag without failing to fully load at least one of the rounds. Not sure what I'm going to do with it.

I would be pleased to take your problem off your hands. I was an armorer in a headquarters company of a tank battalion with 410 M1911A1 pistols subjected to the slings and arrows of life aboard M60 and M60A1 tanks. There's very little that goes wrong with an M1911 that I can't cure.

Think about what you might want for it.

[Double Tap]

Sometimes you just get a faulty firearm too. The last one I bought was a "Rock Island Armory". A fairly inexpensive firearm (around $350.00) that I could carry without worrying about taking a huge loss if it got stolen. The thing is made in the Philippines and is supposed to be a Springfield lower with an old left over G.I. slide. Seemed like a good idea.

Sometimes you see some bad information on the net, but that is a doozy.

Rock Island Armory pistols are made in the Philippines by Armscor. They have a cast slide and frame.

Springfield Armory 1911's are made in Brazil by Imbel and have forged slides and frames.

From my own experience, they are not even in the same league as far as quality, giving the win to SA.