Pistols have a body having a grip, the grip defining an elongated magazine passage adapted to receive a magazine and defining a magazine axis, the grip having opposed left and right side walls and a front portion and an opposed rear portion, the body having an upper portion having a first linear interface element aligned with an attachment axis offset from the magazine axis, and a removable backstrap element adapted to overlay the rear portion of the grip and having a second linear interface element adapted to removably connect to the first linear interface element. The pistol frame may include slide rails defining a slide plane, and the first linear interface element may be parallel to the slide plane. The first linear interface element and the second linear interface element may comprise a sliding interface. The sliding interface may be a dovetail feature.