Barrett XM109

The Barrett XM109 was an experimental anti-materiel rifle concept that grew from Barrett's experience with heavy precision rifles such as the M82 family. Instead of firing conventional .50 caliber ammunition, the XM109 was intended to use 25 mm projectiles for greater payload effect against equipment, light vehicles, and protected targets. It remained a developmental weapon rather than a widely adopted service rifle.

The weapon's design attempted to package a much larger projectile into a shoulder-fired or crew-served precision format. That created an obvious tactical appeal: a small team could engage materiel targets with effects beyond standard rifle ammunition. The tradeoffs were substantial, including recoil management, ammunition bulk, cost, and whether the weapon was practical enough for routine field use.

Because the XM109 did not become a mainstream issued weapon, its value on HiWars is mainly analytical. It shows how designers tried to bridge the gap between sniper rifles, grenade launchers, and light anti-materiel systems. Its limited adoption also illustrates why raw projectile size is not enough: portability, recoil, training, logistics, and rules of engagement all shape whether a weapon becomes practical.