A husband and wife from Texas will be held without bail for four months as authorities continue to investigate why they had an arsenal including an AK-47, an AR-15 with a grenade launcher, a large-capacity shotgun, a bump stock and numerous rounds of ammunition in their Tewksbury hotel room.Francho S. Bradley, 59, and his common-law wife, Adrianne Jennings, 40, both of Frisco, Texas, were ordered held after a dangerousness hearing in Lowell District Court, six days after the weaponry was found in their room.