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Page 9 - 5.56mm NATO Rifles at Western Gun Store

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The 5.56X45mm NATO cartridge was designed by James Sullivan, a member of Eugene Stoner's engineering team that developed both the M16 rifle and its original cartridge. The 5.56X45mm NATO was adopted by the U.S. military in 1964 and by NATO in 1980. With bullet diameter of .224-inch, the original M193 military cartridge used a 55-grain bullet at 3250 fps; the current M855A1 cartridge, developed by FN, uses a 62.5-grain bullet at 3020 fps, offering greater range and better penetration. The civilian version of the 5.56X45mm is 223 Remington; the cartridges are dimensionally identical but military chamber dimensions and specifications for military brass are different. It is considered safe to use 223 Remington ammo in a 5.56X45MM NATO chamber, but not a good idea to use 5.56X45mm ammo in a rifle specifically chambered for the 223 Remington. Although the stopping power of .22-caliber bullets remains controversial the 5.56X45mm has served well in now multiple generations of M16 rifles.

Craig Boddington

Springfield Armory Springfield Armory SAINT Victor Semi-Automatic Rifle 5.56x45mm NATO 16" Barrel (1)-30Rd Magazine Adjustable B5 Enhanced SOPMOD Stock Tungsten Gray Cerakote Finish $0.00 ● Out of stock FFL required

Bushmaster Firearms Bushmaster QRC II Semi-Automatic Rifle 5.56x45mm NATO 16" Barrel (1)-30Rd Magazine Collapsible Carbine Stock Black Finish $0.00 ● Out of stock FFL required

Radical Firearms Radical Firearms AR Semi-Automatic Rifle 5.56mm NATO 16" Barrel (1)-30Rd Magazine Brown Synthetic Stock Black Finish $0.00 ● Out of stock FFL required

Radical Firearms Radical Firearms AR Semi-Automatic Rifle 5.56mm NATO 16" Barrel (1)-30Rd Magazine Flat Dark Earth Synthetic Stock Black Finish $0.00 ● Out of stock FFL required

Patriot Ordnance Patriot Ordnance P415 Edge Semi-Automatic Rifle 5.56x45mm NATO 16.5" Barrel (1)-30Rd Magazine Black MFT Minimalist Stock OD Green Finish $0.00 ● Out of stock FFL required

Patriot Ordnance Patriot Ordnance Renegade + Direct Impingement Semi-Automatic Rifle 5.56x45mm NATO 16.5" Barrel (1)-30Rd Magazine OD Green Finish $0.00 ● Out of stock FFL required

Springfield Armory Springfield Armory Saint Victor Semi-Automatic Rifle 5.56mm NATO 16" Barrel (1)-30Rd Magazine OD Green 6-Position Bravo Company Stock Black Finish $0.00 ● Out of stock FFL required

Springfield Armory Springfield Armory Saint Victor Semi-Automatic Rifle 5.56mm NATO 16" Barrel (1)-30Rd Magazine Flat Dark Earth Furniture Black Finish $0.00 ● Out of stock FFL required

Springfield Armory Springfield Armory Saint Victor Semi-Automatic Rifle 5.56x45mm NATO 16" Barrel (1)-10Rd Magazine Gray Synthetic Stock Black Finish $0.00 ● Out of stock FFL required

Rock River Arms Rock River Arms LAR-15M Operator DMR Semi-Automatic Rifle 5.56x45mm NATO 16" Barrel (1)-30Rd Magazine Synthetic Stock Black Finish $0.00 ● Out of stock FFL required

Stag Arms Stag 15 Retro Semi-Autoamtic Left-Handed Rifle 5.56MM NATO 20" Barrel (1)-20Rd GI Magazine Gray A2 Mil-Spec Buttstock Black Finish $0.00 ● Out of stock FFL required

LWRC LWRC Direct Impingement Semi-Automatic Tactical Rifle 5.56x45mm NATO 16.1" Cold Hammered Forged Spiral Fluted Barrel (1)-30Rd Magazine Black Magpul Grips MultiCam Finish $0.00 ● Out of stock FFL required

Bergara Bersa AR-15 Semi-Automatic Rifle 5.56 NATO 16" Rifled Barrel (1)-30Rd Magazine MFT Minimalist Stock/Grip Matte Black Finish $0.00 ● Out of stock FFL required

Stag Arms Stag Arms 15 Tactical Semi-Automatic Rifle 5.56 NATO 16" Barrel (1)-30Rd Magazine Magpul MOE SL Stock Flat Dark Earth Finish $0.00 ● Out of stock FFL required

Daniel Defense Daniel Defense Dd4 MK18RIII 5.56MM Rifle, 10.3 in barrel, 30 rd capacity, black polymer finish $0.00 ● Out of stock FFL required

Smith & Wesson Smith & Wesson LE M&P15 TS Semi-Automatic Rifle 5.56mm NATO 16" Barrel (1)-30Rd Magazine Folding Magpul MBUS Front & Rear Sights Black Finish $0.00 ● Out of stock FFL required

LWRC LWRC Individual Carbine SPR Semi-Autoamtic Rifle 5.56mm NATO 16.1" Cold Hammered Forged Spiral Fluted Barrel (1)-30Rd Magazine Flip-Up Front & Rear Sights Black Magpul Grips Tungsten Finish $0.00 ● Out of stock FFL required

Arsenal, Inc Arsenal SAM5 Semi-Automatic Tactical Rifle 5.56x45mm NATO 16.3" Barrel (1)-30Rd Magazine Adjustable Sights Fixed Black Polymer Stock Finish $0.00 ● Out of stock FFL required

Rock River Arms Rock River Arms LAR-15M R3 Competition Semi-Automatic Tactical Rifle 5.56x45mm 18" Fluted Stainless Steel Barrel (1)-30Rd Magazine Optic Ready Hogue Rubber Grips Black Synthetic Finish $0.00 ● Out of stock FFL required

Black Rain Ordnance Black Rain Ordnance Spec+ Fusion Rifle 5.56 16 in. barrel, 30 rd, Orange Battleworn finish $0.00 ● Out of stock FFL required

Colt Colt Mfg M5 Carbine Sentry Semi-Automatic Tactical Rifle 5.56x45mm NATO 16.1" Barrel (1)-30Rd Magazine Flip Up Front & Rear Sights Collapsible Synthetic Stock Black Finish $0.00 ● Out of stock FFL required

Diamondback Firearms Diamondback Firearms DB15 Semi-Automatic Rifle 5.56mm NATO 16" 4140 Chrome-Moly, Free Float Barrel (1)-30Rd Gen2 PMAG Magazine Moe Carbine Stock Black Finish $0.00 ● Out of stock FFL required

Colt Colt LE Carbine .223 Rifle 16.1" Barrel 30 Round Black Finish $0.00 ● Out of stock FFL required

Diamondback Firearms Diamondback Firearms DB15 Semi-Automatic Tactical Rifle 5.56x45mm NATO 16" 4150 Chrome Moly Barrel (1)-30Rd Magazine Right Hand Black Synthetic Finish $0.00 ● Out of stock FFL required

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