I just wrapped up a re-read of Marcus Wynne's The Revengers series. Excellent books. Marcus did a great job of including just enough detail about guns and gear to satisfy nerds like me without making his books sound like Sig marketing material, a la Jack Carr. I don't know jack about tradecraft, but based on Marcus' background, I assume he does, and there's plenty of that, as well. Sadly, Marcus passed away a couple years ago. Looks like he published at least part of a fifth Revengers book on Kindle Vella, which I'm working through now.
Also just picked up Gray War, the first book in Peter Nealen's newish Brave New Disorder series. Peter's a former Marine and like Marcus, includes a fair amount of gun stuff without overdoing it. I've read and enjoyed many of his books in the past, and this series seems to be another good one.