.223 Rem | 5.56 NATO

Aero Precision

Aero Precision APCR640436 AR-15 Rifle in 5.56 NATO with 20-Inch Barrel and Black Finish

Aero Precision

Aero Precision M4E1-T AR-15 Rifle with 16-Inch 5.56 NATO Barrel and Magpul SL Stock

Aero Precision

Aero Precision APCR640441 M4E1-T 5.56 NATO Mid-Length AR-15 Rifle with FDE Finish

Smith & Wesson

Smith & Wesson M&P15 Sport III 13807 5.56 NATO Semi-Auto Rifle with 16-Inch Threaded Barrel and Black Stock

Sig Sauer

Sig Sauer M400 V2 5.56 NATO Semi-Auto Rifle with 16-Inch Threaded Barrel and Magpul SL-K Stock

Sig Sauer

Sig Sauer M400 V2 5.56 NATO Semi-Auto Rifle with 16-Inch Barrel and Magpul SL-K Stock

Sig Sauer

Sig Sauer M400 5.56 NATO Semi-Auto Rifle with 16-Inch Stainless Steel Barrel and Magpul SL-K Stock

Sig Sauer

Sig Sauer RM40016BTRDV2COIL M400 Semi-Auto Rifle with 16-Inch Barrel and Magpul SL-K Stock

Heckler & Koch (HK USA)

HK MR556 A4 Semi-Auto Rifle with 16.5-inch Threaded Barrel, Black M-LOK Handguard, and Ambidextrous Safety

Heckler & Koch (HK USA)

HK MR556 A4 Semi-Auto Rifle with 16.5-inch Threaded Barrel in Black, Part Number 81000828

Armalite

ArmaLite M15LTC16 M-15 Light Tactical Carbine in 5.56 NATO with 16-Inch Barrel

Colt

Colt LE6920-EPRII-PRO Enhanced Patrol Rifle in 5.56 NATO with 16.3-inch Barrel