well, you need a screwdriver to get the grip panels off
Actually, the original design allowed for the rim of the cartridge case to remove the grip panels. In the original, you will note that those screw slots are curved down inside to allow for the cartridge rim to be used as a screwdriver. The screw studs themselves are not designed to be removed, and are sort of halfway staked in. To my knowledge, only the ejector and front sight are completely unremovable, being staked on, as is the trigger to the trigger yoke or bar. The rear sight is a wringing fit in the dovetail for adjustment.
In my experience, the 1911 does not come as "battle ready" as many other firearms.
Depends on what you mean by "battle ready." If you mean it needs to be tricked out with three-dot adjustable sights and tuned up and tightened and cleaned and oiled lovingly every day for your personal "battle" carry arm, it is not.
If you mean bust open a crate with your machete and take one out of the crate on Iwo Jima, drop it in the salt mud, and fire it as is for weeks on end, it is.
A parts count for the original indicates 62 of 'em, if I counted right. That includes the mag, spring, and follower of one magazine, and all the parts in the mainspring housing, which is not meant to be field strippable, but rather replaced as one part.
For those having interest, the original factory drawings for all its parts are available at
http://www.loesch.org/~arviel/1911.zip This is about a 4 mB zipped pdf file.
One reason bullseye shooters like it is because the bigger bullet results in higher scores. Consider a 9mm round hitting the target 1/2 of .355" = 0.1775" inches plus 0.0485 inches away from a scoring ring. It would be counted as the next lower score. But a .45 hitting the exact same spot would touch the scoring ring and be counted at the higher score. Sometimes just that one extra point can be a tie-breaker, as you ring-shooters know.
Add 0.001" if you're shooting a .38 at .357" diameter.

As a frivolous further illustration, if you hit anywhere on the paper with the center of a 16" naval rifle shell, it would be counted as in the X-ring. Gives new meaning to the expression "Cleaned the stage," eh, wot?

Terry, 230RN