That doesn't read like Cooper, ending with a preposition.  It's accurate and in "Cooper on Handguns".  For the context -

"Man is often defined as "the tool-bearing animal." Weapons are the tools of power. In the hand of the state, they can be the tools of decency or the tools of oppression, depending on the righteousness of that state. In the hands of criminals, they are the tools of evil. In the hands of the free and decent citizen, they should be the tools of liberty. Weapons compound man's power to achieve whatever purpose he may have. They amplify the capabilities of both the good man and the bad and to exactly the same degree, having no will of their own. Thus, we must regard them as servants, not masters -- and good servants of good men. Without them men is diminished, and his opportunities to fulfill his destiny are lessened. An unarmed man can only flee from evil, and evil is not overcome by fleeing from it. This book will examine one particular form of weapon -- the handgun. The handgun is an interesting artifact, and its mastery is a notable accomplishment. Those who master it achieve a peculiar satisfaction, for they partake in some measure of one of the attributes of the gods -- the ability to point the hand and smite at a distance. This idea existed millennia before anyone ever saw a pistol. So it must be an innate human aspiration, independent of technology. It is obviously the basis of the pleasure we take in pistol craft. As the handgun has no evil of its own, it has no skill of its own; however, in a master's hands, its efficiency is almost unbelievable. As with all instruments, it is the man, not the tool, that makes the difference. The more subtle the tool, the greater the difference. Skill with a shovel makes less difference than with a violin. The handgun lies somewhere between..."