BRG-15

The FN BRG-15 was a Belgian heavy machine-gun program intended to provide more armor penetration and range than the .50-caliber Browning M2HB. FN explored a 15 mm class cartridge, later associated with 15.5 mm development, to approach a Western counterpart to large-caliber Soviet heavy machine guns. The project showed serious technical ambition but did not become a standard production weapon.

The BRG-15's appeal was its high-velocity, large-caliber ammunition and gas-operated automatic fire, promising better effects against light armor than standard .50 BMG guns. That same ammunition also created problems: barrel wear, logistics, and integration costs were higher than simply retaining existing M2HB stocks. The design was potent, but potency alone did not guarantee adoption.

The BRG-15 was ultimately shelved in the early 1990s as FN faced funding and market constraints and focused on programs with clearer adoption prospects. In database terms, it is valuable as a near-miss weapon: a technically capable attempt to replace a legacy heavy machine gun that failed because logistics, cost, and institutional inertia favored the older .50-caliber ecosystem.