C Mod magazine are made here at Choate factory specifically for our Modular Chassis systems. They have been tested in different environment condition and hold up strong. Choate knew from the begin that we wanted to make our own magazine for this Modular Stock system. By doing this we can make the magazine affordable. The Mod. magazine will accept rounds up to 2.850 inches in length. Fits rounds in the .308 Winchester family like 6.5 Creedmoor, .243Win., .260Rem and 7mm-08Rem. As well as other popular calibers like 6mm Remington, 257 Roberts and 7mmX57mm Mauser.