It has a 73mm low-pressure gun, similar to the SPG-9, and a 9S428 (AT-3 Sagger) ATGM launcher. Passengers sit in a rear compartment and can exit via two rear door, or roof hatches. There are firing ports on either side of the hull. The BMP-1 is fully amphibious. There is a trim vane at the front of the hull for use when swimming.