The RTM (Remington Tactical Modular) chassis system, gives you the "one rifle" than can do it all, designed for the Remington 700 long action or custom clones, it's available with your choice of lower units, the "short box" uses the AICS 5 or 10 round magazines for use with the 6XC, 6.5x47 Lapua, 6.5 Creedmoor and .308 cartridges, the "long box" uses the AI 5 round single stack magazines designed for the .300 Win Mag and .338 Lapua Mag, research has shown that other cartridges will also work in the long magazine as well. The RTM comes equipped with four modular accessory forend rails, vertical rear grip system, quick detach sling swivel cups, low height ambidextrous cheek piece and is finished in type III hard anodize. (magazines not included)