Not to hijack the OP's thread, but Oro, what's your opinion of the old Accurizer setup on the original 70's? Do the collet bushings hold up? I've heard from some that they do, and from others that they don't. I've never owned an original Series 70.
I think it's fair to ask as it's the uncomfortable discussion when talking about '70 guns. I'll try to separate fact, opinion and anecdote.
There are a few points about them that are facts:
1) The design itself is very creative and the engineering appealing.
2) Some have failed and locked up guns.
3) The bushings DO require a slightly different take-down method
4) Colt found them appealing enough to use them for 18 years of production.
The rest is opinion and anecdote:
From these facts, over the years I've developed a theory for some of the failures: failure to take down the bushing properly and putting lateral stress on the bushing fingers. This is an untested theory, and probably will always be just a theory.
The '70 barrel is ramped more sharply near the bearing surface. They were left much more tightly fit than prior models. Until well broken-in, to take them down properly you needed to unlock the slide 1/2", THEN turn the bushing. Instead of doing this, most folks bought wrenches and just monkey-armed them off with force. I think this had something to do with weakening some of them.
The other fact is that in 18 years of warranty service, Colt never saw fit to change them - they provided ease to the manufacturing process, and very good accuracy - usually improving with wear, actually.
So my opinion is that I like them. In the matrix of Performance benefit/maintenance hassle/potential problems, I side with liking them very much. In fact, if you could fit them on non-'70 barrels, I'd drop them in some of my other guns when needed.
Others will find they fall on the other side of the matrix, and that's OK. But I've never had a problem with them and I get enhanced performance out of them. This is my opinion and I don't expect everyone to share it or follow it. But my '70 guns still have their original "Accurizer" bushings and I like them.