Looking for firearms/sniper expertise (research only)

No, I don't want to issue a contract on someone's life.
I've just finished the first draft of my new Mike Delaney thriller, a follow up in series to 'The Immortality Plot'. I'm calling it (at the moment) 'Good Girl Bad Girl'. I like the title but my wife thinks it sounds like chick-lit. It is certainly anything but. However, if the title means readers who wouldn't normally read this kind of book take a look then I will be grateful. It might convince them to read the whole novel.
Here is where I need some expert help. If you are someone or know someone who is an expert on firearms, sniper rifles, sniper practice and covert activity then I would love to hear from you.
There are a couple of sections in the book‚ probably about ten pages in all, where I need some expert review advice. Just to make sure I have got things right.
Sometimes however much research you may do just cannot compare with someone's personal experience.
I cannot offer you anything in the way of recompense save a free copy of any of my  books.
If you can help then just contact me at info@davidcallinan.com and we'll take it from there.