Browse our inventory of .223 Rem / 5.56 NATO ammunition from trusted brands like Federal Ammunition, PMC, Speer, Fiocchi, and Hornady. ICB Firearms stocks reliable, accurate .223 Rem rounds built for AR shooters, varmint hunters, and tactical enthusiasts who want consistent performance from one of the most popular rifle calibers in the country. From lightweight varmint loads to mil-spec 5.56 NATO and match-grade target rounds, we stock a variety of options to fit your AR platform or bolt action rifle. Pair your rounds with rifle ammunition and rifles from our lineup, then stock up on the right magazines to keep your rifle fed. Round out your kit with handgun ammunition, AR rifles, and scopes sights and optics from our full inventory.
Shop .223 REM and 5.56 NATO at ICB Firearms and find the most widely used centerfire rifle cartridge family in America, powering the AR-15 platform that defines modern sporting rifle use for home defense, competition, varmint hunting, and range training. From affordable bulk range loads to quality defensive and hunting ammunition, and from entry-level AR-15 builds to precision semi-automatic and single shot configurations, our St. Clair Shores selection covers everything .223 Rem and 5.56 NATO shooters need.
Explore the full .223 Rem and 5.56 NATO lineup at ICB Firearms:
ICB Firearms is the full-service firearms dealer in St. Clair Shores, Michigan, and serves customers in the nearby cities of Macomb, Clinton Township, Grosse Pointe, Warren, and Royal Oak. All rifle purchases at ICB Firearms are conducted in full compliance with federal and Michigan state law, including ATF Form 4473 and a NICS background check for every firearm sale. Michigan enacted universal background check requirements for all firearm sales, including private transfers, in 2023, and all transactions are processed accordingly.
Buyers must be at least 18 years of age to purchase a rifle from a licensed dealer under federal law and must meet all applicable state and federal eligibility requirements. Michigan has no state-level assault weapons ban or additional restrictions on .223 Rem or 5.56 NATO rifles beyond federal law, making the AR-15 platform and other configurations fully accessible to eligible residents. Michigan’s Lower Peninsula rifle deer zones require straight-wall cartridges, meaning .223 Rem and 5.56 NATO are not legal for deer hunting in Lower Peninsula rifle zones. These calibers may be used for coyote, varmint, and other legal small game hunting in Michigan where applicable regulations permit. Short-barreled rifles with a barrel under 16 inches require NFA registration, a $200 tax stamp, and ATF approval prior to transfer.
Michigan’s 2024 safe storage law requires all firearms to be stored securely to prevent access by minors when not under the direct control of an authorized adult. A quality rifle safe or locking cabinet is the recommended storage solution for .223 Rem and 5.56 NATO rifles of any platform. Contact ICB Firearms for help selecting the right .223 Rem or 5.56 NATO rifle, parts, or ammunition for your Michigan home defense setup, varmint hunting application, or range training program.
ICB Firearms carries a broad selection of .223 Rem and 5.56 NATO rifles spanning AR-15 platform builds, other semi-automatic configurations, single shot rifles, and pump action options. AR-15 chambered in 5.56 NATO or .223 Wylde is the most popular and widely available configuration, covering everything from entry-level builds to premium competition and precision setups. Stop in or check online for current .223 Rem and 5.56 NATO inventory across all available platforms and configurations.
.223 Remington and 5.56 NATO are nearly identical in external dimensions but differ in chamber specifications and operating pressure. A rifle chambered in 5.56 NATO can safely fire both 5.56 NATO and .223 Remington ammunition. A rifle chambered strictly in .223 Remington should only fire .223 Remington, as 5.56 NATO operates at higher pressures that can exceed safe limits in a .223 Remington chamber. Most AR-15 rifles are chambered in 5.56 NATO or .223 Wylde, which safely accepts both cartridges and is the most versatile option for shooters who run both ammunition types.
.223 Rem and 5.56 NATO are not legal for deer hunting in Michigan’s Lower Peninsula rifle deer zones, which require straight-wall cartridges. In Michigan’s Upper Peninsula, where bottleneck centerfire cartridges are permitted, .223 Rem and 5.56 NATO may be used for deer hunting where legal, though many hunters consider these calibers marginal for ethical deer harvest at typical hunting distances and prefer larger calibers. Both cartridges are legal and well suited for coyote and predator hunting in Michigan year-round. Always verify current Michigan DNR regulations for your specific species, zone, and season.
Yes. AR-15 platform rifles chambered in 5.56 NATO and .223 Remington are legal to purchase, own, and use in Michigan for eligible residents. Michigan has no state-level assault weapons ban or magazine capacity restrictions beyond what is required under federal law. All purchases require a federal background check and completion of ATF Form 4473. Michigan’s 2023 universal background check law also applies to private transfers. Buyers must meet all applicable federal and Michigan state eligibility requirements to take possession.
In Michigan, .223 Rem and 5.56 NATO are best suited for home defense, coyote and predator hunting, varmint control, competitive shooting including 3-gun and practical rifle competition, and high-volume range training. The caliber’s flat trajectory, low recoil, and wide ammunition availability make it an excellent all-purpose choice for these applications. For Michigan hunters, the caliber is a natural fit for coyote calling across open fields and agricultural terrain where predator hunting is popular year-round.
The most popular barrel length for a .223 Rem or 5.56 NATO AR-15 is 16 inches, the minimum legal barrel length for a standard rifle configuration without NFA registration. A 16-inch barrel provides a good balance of velocity, handling, and maneuverability for home defense, range training, and hunting. Longer barrels of 18 to 20 inches are popular for precision and competition use where additional velocity and harmonics improve long-range accuracy. Barrels under 16 inches require NFA registration as a short-barreled rifle. The staff at ICB Firearms can help you select the right barrel configuration for your intended application.
ICB Firearms carries a range of AR-15 parts and components for .223 Rem and 5.56 NATO builds, including barrels, bolt carrier groups, triggers, handguards, stocks, buffer systems, and other internal and external components. Whether you are building a new AR-15 from scratch, replacing worn components, or upgrading for improved performance in competition or hunting, our parts selection covers the most common needs across popular AR-15 configurations. Stop in or contact ICB Firearms to check current parts inventory.
Michigan’s 2024 safe storage law requires firearm owners to store all firearms, including .223 Rem and 5.56 NATO rifles, securely to prevent access by minors when not under the direct control of an authorized adult. A locked gun safe, locking rifle cabinet, or trigger lock meets the storage requirement. Violations can result in criminal penalties if a minor accesses an unsecured firearm and causes harm. Contact ICB Firearms for recommendations on rifle safes and long gun storage solutions appropriate for AR-15 and other rifle storage.
