.223 Rem | 5.56 NATO

Heckler & Koch (HK USA)

HK MR556 A4 Semi-Auto Rifle with 16.5-inch Threaded Barrel and Ambidextrous Features

Heckler & Koch (HK USA)

HK MR556 A4 Semi-Auto Rifle with 16.5-inch Threaded Barrel, 5.56x45mm, Patriot Brown Picatinny Rail, M-LOK Handguard, and Ambidextrous Safety

Springfield Armory

Springfield Armory SPG HL918556B Hellion 5.56 NATO 18-inch Bullpup Rifle with Adjustable Stock and Flip-Up Sights

Springfield Armory

Springfield Armory HL920556B Hellion 5.56 NATO 20-Inch Bullpup Rifle with Ambidextrous Safety and Flip-Up Sights

Ruger

Ruger AR-556 MPR 5.56x45mm NATO Rifle with 18-Inch Barrel and Magpul SL Stock

Aero Precision

Aero Precision APCR640435 AR-15 5.56 NATO 16-Inch Mid-Length Barrel with Magpul Furniture and Drop-In Handguard

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