Parson;
First off, I don't want to give the wrong impression. My experience in this regard is almost by accident - I was sort of "drafted" :-[
What we found was that a "comedy of errors" contributed to this situation (there was a similar happening with the 1911a1 back in the early 80's).
The guns we were seeing here, were very well cleaned and lubed according to the practice of that service's doctrine (meaning lightly lubed).
The real culprit (complicated by the design of the M9) was that at some point the old CLP - "Cleaner - Lubricant - Protectant " (that's the Army way of getting three lies for the price of one

) was changed from the old stuff manufactured by Break-Free (which was not all that great a cleaner but it was a good lube!). This stuff is much thinner and it is a very poor lube. It works for a while but after about 100 to 200 rounds you could actually hear the guns "squeek" if you ran the slide manually....anyone who has used an M9 knows it is known for smoothness...well not after this new stuff is applied.
We cleaned the guns thoroughly and applied TW-25b grease the way it is supposed to be (well we did not heat the guns up) - which means to remove any excess. They then run for quite a while though a few get balky at about the end of the 500 round day and have to have a shot of TW25b spray. I feel sure any other modern high tech lube like Militech or Tri-Flow or Ultimalube would work also.
The new locking block has little rounded cuts on the inside corners. Also be sure to lube the locking surfaces and its pivot point!
On my guns I replace the mainspring with a Nowlin 21 lb 1911 mainspring - some use the 19lb but it is not as reliable in ignition with some really junky foreign ammo. This results in a trigger pull roughly equivalent to the Langdon custom trigger but that one has an overtravel stop that is well worthwhile. If you have a military gun you will have to live with it - though we were able to do something through "semi- official" channels (some Generals do have an account with Brownells

) for one group going to Afghanistan.
There is a Border Patrol mod to the trigger return spring which replaces the "mousetrap" spring that comes in the gun with a coil spring and plunger. I prefer the heavier of the two springs available from Brownells but to be honest, I can live witht the factory piece.
*Do not Dry Fire* the M9 wihtout a snap cap or piece of empty brass in the chamber - almost all broken firing pins come from this. I have seen firing pins broken in as many as 4 pieces form repeated inapropriate dry fire. Decocking blocks the hammer and is no problem.
A common problem is magainzes. The original Beretta mags are best but there is a cleaning and assembly problem also....people get the spring back in wrong. Look for the end of the loop of the spring in the little window at the top of the mag where the slide stop would engage the follower....if it is not there the spring is in backwards.
Keep it clean, inspect it frequently (Somewhere I have a copy of an Army PM magazine article that says : "Your M9 will develop cracks, it is a question of when"). Watch the left side of the slide right at the little trademark oval. Watch the locking block corners. Watch the square cuts in the frame.
The little "slide catcher" does work if your slide does break but they should never reach that point if you check.
Make sure the little star washer is under *every* grip screw - else they enter the mag well and drag on the magazine.
Never load 16 rounds in the mag!!!!
Learn to manupulate the lide *underhanded* to avoid inadvertently actuating the safety.
That's all I can think of off the top of my head.
Onward,
Jim
PS, I have no idea how many of the problems transfer over to the Taurus - obviously the safety is different.