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Direct-fire projectiles fired by recoilless guns.
Recoilless Munitions
The impact or effect the munition is intended to have

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Where the munition is launched from and what it targets

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The type of fins visible on the munition

Fins Characteristic (5)

The nominal diameter of a projectile. For most modern munitions, this is expressed in millimetres (e.g. 82 mm mortar projectile), but older artillery gun projectiles may be described in inches.

Calibre (51)

Weight class of the aerial bomb pictured

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Recoilless Munitions
Recoilless guns are direct-fire guns distinguished by a system of operation in which propellant gases (or another counter-mass, such as a powder or liquid) are expelled from the rear of the barrel in order to offset the recoil generated by forward momentum of the projectile. Many recoilless weapons have smoothbore barrels; however, several well-known models have rifled barrels. Weapons of the latter type are sometimes referred to as ‘recoilless rifles’. Recoilless weapons are generally sorted into two subcategories: crew-served recoilless weapons and shoulder-fired recoilless weapons.
OSMP710
Analyst Note:
Markings on this 106 mm recoilless gun projectile indicate it is a M344A1 high explosive anti-tank (HEAT) round (“CH-106-M344-A1”) produced by Fábrica Nacional de Granada (“FNG”), Spain, in 1984 (“84”). The packing crate identifies the intended weapon as an M40A1 Cañón sin retroceso, or ‘recoilless rifle’ (“C.S.R. 106 M40 A1”). Other markings show that the round is fitted with an M509-type point-impact, base initiating (PIBD) fuze (“Espoleta PIBD M509”), and give additional details such as the expected muzzle velocity (“V₀”) of 503 m/s. (ARES)