Now back to your regular (3G) programming...
As suggested at your first match check out what everyone is shooting and ask questions...take your time when looking at the guns though...on first glance they may all look alike...mostly black and style ABC rifle and style XYZ shotguns...it is the details that I look for i.e. comps, optics, triggers, etc...not necessarily the "brand" of receivers (plenty of threads on those by searching).
Be careful.
Re-read Tim's post +1