Sig Sauer MCX-Spear Magazine 20rd Double Stack 277 Sig Fury/6.8x51mm/6.5 Creedmoor/7.62 NATO Coyote Tan Steel MAGSPEARMULTICOY. 5 Creedmore 21 Round - This is a factory replacement 20-rd magazine for the MCX-SPEAR. This magazine has been engineered...