Be careful of getting to far into the weeds with weapons, ammo and other details.
I have read at least 5 Clancy novels. Each and every one I enjoyed but they all suffered the same flaw. He got way too far into the weeds with details. Page after page. I soon learned to recognize his wind up for the detail swamp and would soon be flipping pages to get past the tedium. Readers tend to enjoy the flow and momentum of a story far more than paragraphs of details that very few people understand.
Clancy and those authors he inspired were/are not normal writers. They write techno thrillers for readers who dote on that detail in ships, planes, etc.
I just finished one by Larry Bond, about a renegade Indian admiral who ordered a sub to fire Russian nuclear-tipped torpedoes into Chinese ports. Someone in the hospital gave it to me. Not a favorite, but readable.
My favorite is the former A-6 pilot turned lawyer who wrote Flight of the Intruder and its series. I liked learning the A-6 capabilities and vulnerabilities and how the crews begged for a gun for MiG protection and to strafe.
I read Clancy's, Playboy interview and learned the odds he overcame to become a success. I enjoyed his books, but they are mainly for military and buffs who like that technical detail.
I wrote some stories on FanFiction.net, mostly about, The Lost World. A UK editor chided me in reviews for mentioning gun and binocular brands and models, although not in profuse detail. I did have people loading guns correctly, one sort being a S&W M&P .38 and noted rifles like .275 Rigby and .375 H&H and other rifles. This editor pointed out that most readers were women, who didn't know or care about such things. Turned out he published romances. He never quite got it that I wasn't writing romances. I was writing jungle adventures and a murder mystery. There are romances among the cast, but the tales were basically adventures, some on safaris after the explorers left the Plateau of the show.
Male readers did like the products mentioned, and one nurse in Chicago even said she looked up the products and animals, inc. snakes, to learn more about them. If female readers just skim such stories looking for erotic scenes between Lord Roxton and their favorite heroine, that's there, too. But if that's all fans wanted, other authors concentrated on it. I don't think it hurt to say that someone used Zeiss or B&L binoculars! It wasn't a discussion of Porro vs. Abbe-Koenig prisms like I wrote in product reviews for magazines.
Look at James Bond in Fleming's books: wasn't he more complete because we knew about his preferred drinks, his Ronson lighter, the special Morland's cigarettes, his restored Bentley, his Beretta and Walther pistols, his old Scottish housekeeper?
Some readers like at least some detail. Clancy's genre of books specialized in that, for a receptive audience. On the whole, I think Ian Fleming got the balance about right.
BTW, I think Jack Higgins greatly overstates the effect of .25 ACP hollowpoint ammo...