Match definitions vary on what is accepted as Stock. If you have questions ask the Match director prior to competing in the event. It is the shooters responsibility to know and abide by all rules. Weapons not meeting the stock gun requirements may be disallowed by the match officials, or protested by any shooter. Posted times will be disallowed and no reshoots given if protested guns do not meet stock gun requirements.
Some matches allow the use of optics and scopes, others impose additional restrictions.
Additional restrictions may include the following. Maximum weight limits will be 44 ounces on semi-automatic weapons without a clip, and 54 ounces on revolvers. Both weight limits are while guns are empty. Optics, porting, and added weight are all allowed. As in the pin gun and stock gun events, the shooter will shoot 6 tables of five pins for an aggregate total of the best 5 tables.