Abstract: A building block that can be assembled into structures without requiring special end or corner pieces. The block has top and bottom surfaces that contain a cooperating projection and slot for stacking the blocks. Two end surfaces and two side surfaces complete an enclosed volume. One side and one end surface has at least one interlocking male portion. The other side end surface has at least one cooperating slot portion into which the male portion fits to interlock the blocks.

Abstract: This invention relates to a polymeric ballistic material comprising a high molecular weight, high density polyethylene (HMW-HDPE) and/or composite, and to articles made from this ballistic material suitable for stopping projectiles. The articles may include backstops for firing ranges and home use, armor for vehicles, personnel, and aircraft, training targets, protection for temporary or mobile military and/or police installations, buildings, bunkers, pipelines or any “critical” need equipment that might require protection from ballistic impact, and the like.