Underwood Ammo AR-15 Parts & Accessories

Underwood Ammo is an American boutique ammunition manufacturer based in Sparta, Illinois, specializing in high-performance pistol and rifle loads — particularly +P and +P+ defensive cartridges. The company produces ammunition loaded with Lehigh Defense solid-copper projectiles including Xtreme Defender, Xtreme Penetrator, and Xtreme Hunter, as well as more conventional jacketed hollow-points and hard-cast lead loads. Underwood''s hunting rounds are known for advertised muzzle velocities above standard factory ammunition, appealing to handgun hunters and woods-carry users. Calibers range from .380 ACP through 10mm Auto, .44 Magnum, and .45-70 Government. The brand is popular among shooters seeking non-standard defensive loads.

Underwood Ammo has 319 products available on GunPartPicker, ranging from $0.00 to $175.00.

Underwood Ammo Product Categories

• Ammunition: 69 products
• 9mm: 33 products
• 10mm Auto: 28 products
• .45 Colt: 22 products
• .40 S&W: 20 products
• .357 SIG: 16 products
• .45-70 Govt: 15 products
• .458 SOCOM: 13 products
• .380 ACP: 12 products
• .45 ACP: 11 products
• .44 Magnum: 11 products
• .38 Special: 11 products
• .44 Special: 6 products
• .357 Magnum: 6 products
• .450 Bushmaster: 6 products
• .300 Blackout: 5 products
• .308 Win: 4 products
• .223 Rem: 4 products
• 6.5 Creedmoor: 4 products
• .338 Lapua: 3 products
• .350 Legend: 3 products
• .32 ACP: 2 products
• .38 Super: 2 products
• 6.5 Grendel: 2 products
• .22-250 Rem: 2 products
• .30-06 Springfield: 2 products
• .270 Win: 1 product
• .243 Win: 1 product
• 7.62x39mm: 1 product
• .30-30 Win: 1 product
• 7mm Rem Mag: 1 product
• .300 Win Mag: 1 product
• .224 Valkyrie: 1 product

Stock status: 126 in stock, 193 out of stock.