A detachable box magazine for use with Vanguard Synthetic DBM or Sporter DBM, or any Vanguard rifle that has been retrofitted with our Detachable Box Magazine Kit. Durable injection molded plastic. Magazine holds 3+1 in chamber and is available for .25-06 Rem., .270 Win. and .30-06 Sprg. Also fits selected Howa 1500 and Smith & Wesson and Mossberg versions of the Howa 1500 (requires retrofitting with the Detachable Box Magazine kit).