The best gun for any application is the one that you fits your hand properly and that you can shoot accurately.
Open
Glock
Best is a relative term that has to many variables.
Best left to a qualifed gunsmith
Whichever one best suits your needs.
Best left to a gunsmith
The Kel Tec in .40 is probably your best best.
The daranger (not correct spelling sorry) its a small handgun that can eather fire a .45 or a .410 shotgun shell.
Best left to a gunsmith
inch or mm
Best is very subjective. Sig Sauer and H&K are among the best in general.
Best to ask a gunsmith for help