[4] While troops praised its effectiveness, the M67 came under heavy criticism due to the weapon's weight and length as well as its backblast, which often precluded its use in offensive operations.

[4] The M67 was also issued to anti-armour platoons of 1 ATF (Australian/New Zealand Task Force) during the Vietnam war, being used near the perimeter of the defense bases due to its weight.

This may have been to simplify logistics, or it may be that ammunition for the Carl Gustav could not be sourced due to Swedish opposition to the war in Vietnam.

[7] Lastly, Combat Engineer units used the M67 as a demolition gun to destroy bunkers and other hard point targets as part of their MTOE (Modified Table Of Organization & Equipment) at least as late as 1990.

[8] In February 2011, it was reported that stocks of surplus M67 recoilless rifles were reintroduced to the 101st Airborne Division for limited combat service in Afghanistan.

Numbers of these weapons were issued to the 506th Infantry Regiment, "Currahee", 4th Brigade Combat Team, for use against fortifications, and concentrations of enemy personnel.

[9] The M67s were eventually phased out again as the Army expanded issuing of the M3 Carl Gustav recoilless rifle to regular infantry units.

[13] The M67 is shaped like a long tube with the sight assembly and trigger offset to the side in opposite directions about halfway along the barrel.

It is then swung closed and when the rifle is fired, the rear end of the shell case breaks up and is blown out of the back of the breech block.

The explosive charge collapses a conical metal liner inside the warhead into an extremely high-velocity superplastic jet.

This superplastic jet is capable of penetrating steel armor to a depth of seven or more times the diameter of the explosive charge.

The end of the projectile is a long and narrow stand-off of a length that allows the HEAT warhead to achieve maximum effect against the target.

The canister consists of a thin-walled, deep-drawn, aluminum body that contains a payload of 2,400 eight-grain (0.5 g), low-drag, fin-stabilized, steel-wire flechettes.