The M40 recoilless rifle is a portable, crew-served 105 mm recoilless rifle made in the United States. Intended primarily as an anti-tank weapon, it could also be employed in an antipersonnel role with the use of an antipersonnel-tracer flechette round. The bore was commonly described as being 106 mm caliber but is in fact 105 mm; the 106 mm designation was intended to prevent confusion with incompatible 105 mm ammunition from the failed M27. The air-cooled, breech-loaded, single-shot rifle fired fixed ammunition and was used primarily from a wheeled ground mount or M92 ground mount. It was designed for direct firing only, and sighting equipment for this purpose was furnished with each weapon, including an affixed M8C .50 cal spotting rifle.
A Pakistan Army 106mm recoilless rifle positon - 1965 war.
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Recoilless Rifle Crows Nest, 1966 (49715523498)
RR Position, 1966 (49716062161)
Men of Company "B", 5th Battalion, 7th Cavalry, 1st Cavalry Division (Airmobile) setting the timing on a 106mm (XM 581) Beehive (Anti-personnel) round, An Khe, 31 January 1967
Ronnie Rentz Works on a 106mm Recoilless Rifle, 19 December 1967 (28717178693)