The best weapons in my opinion are:
Shotgun – Kel-Tec KSG (love that scope)
Rifle – H&K M27 IAR (almost no kickback, same scope as KSG)
Carabine – IMI Tavor CTAR-21 (very little kickback, very high firerate, great scope)
Revolver – Chiappa Rhino 60DS (no kickback, easy to reload)
Semi pistol – Colt M1911 (great firerate, nice aiming sight) and Glock 17 (for those matches that are needing more than 7 bullets)
And as Old West guns go, you can buy them all except the Colt Single Action Army since Ruger Vaquero has better firerate.