what is difference between 5.56 and 223 ammo

“Sig Sauer Romeo1Pro 1x30mm TruHold Lockless Zeroing System” has been added to your cart. View cart

“Hogue Compound OTF Automatic Knife – 3.5″ Plain Tanto Blade with Black G10 and Aluminum Handles” has been added to your cart. View cart

“223 5.56×45 Ammo 55gr FMJ Federal American Eagle (AE223BKX) 1000 Round Bulk Case” has been added to your cart. View cart

“223 5.56×45 Ammo 55gr FMJ Federal American Eagle (AE223BKX) 1000 Round Bulk Case” has been added to your cart. View cart