LSI Howa Detach Mag Kit 6.5X55 10Rd W/Floorplate All kits and magazines are made of tough polymer construction and are priced well below many competitive products. Standard long action kits and magazines are available in 5 or 10 round capacities, while long action magnum calibers will be available in 5 round capacity, only. All of these kits are drop-in ready, and can be installed in minutes.