The M109 is an American 155 mm turreted self-propelled howitzer, first introduced in the early 1960s to replace the M44. It has been upgraded a number of times, most recently to the M109A7. The M109 family is the most common Western indirect-fire support weapon of maneuver brigades of armored and mechanized infantry divisions.

Early variants had a short, 23-caliber barrel. Later versions, including the M109A6 Paladin, have a 39-caliber barrel. The M109 has a crew of six: commander, gunner, driver and three ammunition...

The Barrett XM109, originally known as the Objective Sniper Weapon (OSW) and now called the Anti-Materiel Payload Rifle (AMPR), is a prototype anti-materiel sniper rifle. It is chambered for 25 × 59 mm grenade rounds and was developed by Barrett Firearms Manufacturing.

The replacement of the 23 caliber long barrel with the M284 cannon 39-caliber barrel on the M109A5/A6 increased the range capability to 30,00 meters. The 155-mm Projectile weights 98 pounds. The howitzer is a vehicle that provides armored combat support, is air transportable, internally loaded, and has excellent ground mobility.

BAE Systems upgrades the lethality of the latest generation M109 Self-Propelled Howitzer (SPH) by integrating the proven Rheinmetall L52 155mm, 52-caliber cannon system. Merging these two highly capable artillery systems, the M109-52 SPH provides the optimal balance between lethality, system maturity, weight, and reliability.

It is a successor to the short barrel Vietnam era M109 and predecessor to the more capable A5 and Paladin models. The M109A1 is a modernized Vietnam era M109. The main improvement being the much longer 39-caliber 155mm howitzer. This has a longer effective range than the older 23-caliber howitzer, and can fire an expanded family of shells.

The main difference was the long barrel M126A1 howitzer to provide a far greater effective range. It shares however the same M127 mount and ammunition (still 28). For export solely an improved variant was designed on the M109A1 basis, with the M109A1B designation.

2006年7月1日 · The M109-series medium, self-propelled howitzer is a full-tracked, armored combat support, internally loaded, air transportable, vehicle powered by an eight cylinder, diesel engine. The system is capable of both direct (line of sight) and …

2019年7月8日 · The current barrel length of the M109 howitzer is about 29 feet. The new 58-caliber barrel that the Army Test and Evaluation Command ran through the urban paces this spring is six feet longer.

The new 155 mm 39 calibre barrel is fitted with a revised muzzle brake, with the maximum recoil increase on the M109L being only 100 mm. The existing breech and breech ring of the original M109 have been retained.