16. Handguns must be based on and visibly resemble the classic 1911-genre design. This means a single-stack, one piece metal frame, and a dust cover (without an accessory rail) which has a maximum length of 75mm when measured from the leading edge of the dust cover to the rear of the slide stop pin. Magazine well openings cannot exceed a maximum outside width of 35mm. Compliance is checked by way of a 35mm wide, and at least 5mm deep, notch carved into the outside of the box, or by use of a ruler or caliper, as approved by the officiating Range Master.
17 Prohibited modifications are slide lightening cuts, weak hand thumb rests and slide rackers.
18. Permitted modifications are those of a cosmetic nature (e.g. custom grip panels, scrimshaw or similar surface engravings, checkering or serrations etc.), replacement single or ambidextrous thumb safeties, and any open sights (which may be embedded into the slide).
19. Magazines accessible to a competitor during a COF must not contain more than 8 rounds (for Major power factor) or 10 rounds (for Minor power factor) at the Start Signal.