.223 Rem | 5.56 NATO

Sig Sauer

Sig Sauer MCX Spear LT 5.56 NATO Rifle with Folding Brace and 30-Round Capacity - Model PMCX556N11BIR

FN

FN SCAR 15P SBT Brace Semi-Automatic Pistol with 7.5-inch Barrel in 5.56x45mm - Black

Battle Arms Development

Battle Arms Development OIP003 Gen3 .223 Rem/5.56 NATO Rifle with 16-Inch Barrel

Heckler & Koch (HK USA)

HK MR556 A4 Semi-Auto Rifle with 11-Inch Barrel in Patriot Brown and Black Synthetic Finish

Heckler & Koch (HK USA)

HK 81001202 MR556 A4 5.56x45mm Rifle with 11-Inch Threaded Barrel and M-LOK Handguard

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

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