Shoulder-launched Multipurpose Assault Weapon - Design

Design

The Shoulder-launched Multipurpose Assault Weapon has an 83.5mm tube and fires 83-millimetre (3.3 in) rockets. It is a man-portable weapon system consisting of the MK153 launcher, the MK 3 encased HEDP rocket, the MK 6 encased HEAA rocket, and the MK217 spotting rifle cartridge. The launcher consists of a fiberglass launch tube, a 9mm spotting rifle, an electro-mechanical firing mechanism, open battle sights and a mount for the MK42 Day Sight and AN/PVS-17B night sights.

The SMAW MK153 Mod 0 launcher, based on Israel Military Industries' B-300 weapon, consists of the launch tube, the spotting rifle, the firing mechanism and mounting brackets. The launch tube is made of fiberglass-epoxy composite material with a gelcoat on the bore. The spotting rifle, a British design (derived from the LAW 80), is mounted on the right side of the launch tube. The firing mechanism mechanically fires the spotting rifle and uses a magneto to fire the rocket. The mounting brackets connect the components and provide the means for boresighting the weapon while the encased rockets are loaded at the rear of the launcher. The spotting cartridges are stored in a magazine in the cap of the encased rocket.

The 9mm spotting round is ballistically matched to the rocket and serves to increase the gunner's first-round hit probability. Each round consists of a special 9mm tracer bullet, crimped into a 7.62x51mm NATO casing with a .22 Hornet blank cartridge for propellant. The system can be used in conjunction with the AN/PEQ-4 aiming light in place of the spotting rifle.

Training is accomplished with the MK7 Mod 0 encased common practice rocket and the MK213 Mod 0 noise cartridge. At 152.3 decibels, the weapon is one of the loudest on the battlefield, second only to a mine-clearing line charge.

Like many other rocket weapons, backblast is a significant safety concern. The backblast extends in a 90-meter, 60° cone to the rear of the weapon. The backblast is lethal out to 30 metres (98 ft), and still extremely dangerous to 90 metres (300 ft). The resultant shock wave can even cause sympathetic detonation of unsecured ammunition.