900.00 BCL MRX Bison .223 (Interested in Trade For RDB) London May 30, 2024 - 6:51 PM J Julian Selling a 12.5" BCL MRX Bison in black. It comes with 4 proprietary 20-round mags! Low round count. About 60-80 rounds. Comes with original furniture, and excellent Trigger Tech trigger.