MT-A850BK MTECH rpl6i320o USA MT-A850BK SPRING ASSISTED KNIFE "4""" CLOSED folding knife steel sharp 6d5zp2oxx67 edge blade pocket MT-A850BK MTECH rpl6i320o USA MT-A850BK SPRING ASSISTED KNIFE "4""" CLOSED folding knife steel sharp 6d5zp2oxx67 edge blade pocket