If you want to have a professional understanding of firearms, then look at the complete manual of firearms hunting, the science in firearms for professional tactical firearms, the dk firearms encyclopedia for understanding the structural theory of firearms and ammunition, the manual of individual combat skills, and the global anti-terrorism action guide for special tactics. Of course, these books can be bought online, and some can't, but you can find resources. Sensitive books, such as Battle Bible and gogogo Special Police Tactical Manual, mainly focus on cqb and mout, but some contents have been deleted. For example, gogogo's rifle is no longer used, but he still has some skills of automatic pistol loading and still writes some very professional tactical actions.

Of course, I advise you in a word, if you want to know some special tactics, you must always be a soldier, you can be a detective with a little gx at home, and you can be a special soldier with hard work. There are professional instructors in the army to give you guidance. With more guns and ammunition, it is much better for you to practice than to talk on paper at home. And now that China is developed, it will not lose its special forces. The theory and practice of cqb (indoor fighting) and cqc (unarmed fighting) are also taught abroad, which is not much worse than the ranger and seal seen in movies and games. If you want to learn skills and have fun, don't sr, or you will change not your life, but yourself.