Systems for holding tactical gear, such as firearm magazines, weapons, etc., and for connecting such holders to a harness are described and may include a carrier, and an accessory holder that is configured to attach to the carrier. The carrier and/or the accessory holder may be formed from substantially rigid materials, such as plastic or the like, and may be configured to be easily attached and detached from one another, using preconfigured, integral connectors. The connectors may be configured to resist rotation of the carrier and accessory holder with respect to each other, and/or to secure the accessory holder at a fixed angle with respect to the carrier. The accessory holder may also include flanges, surface treatments, or other features, that assist in holding the accessory in the holder.