AR-15 Big Bore Pistols - .458, .450, .50 Cal | Premium Quality Pistols

Moriarti AR-15 Big Bore Pistols - Collection of .458 Socom, .450 Bushmaster, and .50 Cal

Shop Moriarti Big Bore Pistols chambered in powerful AR-platform calibers including .458 SOCOM, .450 Bushmaster, and .50 Beowulf (12.7x42). These complete firearms combine large-bore cartridge options with compact and specialty AR configurations. Browse available models by caliber, barrel length, handguard, muzzle device, furniture, finish, and included components. Whether comparing .458, .450, or .50-caliber options, review each Moriarti big bore pistol's individual specifications, magazine requirements, and recommended lower configuration before selecting your firearm.

What is the difference between .458 SOCOM, .450 Bushmaster, and .50 Beowulf pistols?

.458 SOCOM, .450 Bushmaster, and .50 Beowulf (12.7x42) are big-bore cartridges that can be used in AR-platform firearms, but they differ in cartridge dimensions, bullet diameter, ammunition selection, and ballistic characteristics. .450 Bushmaster uses a .452-inch projectile, .458 SOCOM uses a .458-inch projectile, while .50 Beowulf/12.7x42 represents the larger .50-caliber option. Each requires caliber-appropriate upper components and magazines, and performance varies with barrel length and ammunition.