
5.56x45 Rifles
- In StockCOLT'S MANUFACTURING AR-15 Platform Carbine 5.56mm NATO 16.1in Semi-Automatic Rifle (LE6920-OEM1)16" Chrome Lined Barrel1:7" Twist with 6 Lands and GroovesCarbine Length Direct Impingement Gas SystemMulti Lug Rotary Locking BoltForged Flat Top Upper ReceiverAluminum Upper and Lower ...$850.99
- In StockRADICAL FIREARMS Socom 5.56mm 16in 30rd OD Green Semi-Automatic Rifle (FR16-5.56SOC-15RPR-ODG)16in 4140 Chrome Moly Vanadium BarrelA2 Flash HiderForged 7075 T6 Upper and Lower ReceiverFree Float Handguard6 Postion StockB5 Type 23 Pistol Grip The RADICAL FIREARMS Socom 5.56mm ...$457.99
- In StockAERO PRECISION AC-15M 5.56 16in 30rd Mid-Length Complete Semi-Auto Rifle (APCR100019)Standard M4 upper receiverMagpul MBUS rear sight and A2 front sightStandard M4 mid-length with heat shieldCarbine with A2 pinned front sight blockStandard A2 flash hiderGen 2 lower receiver with ...$893.99
- In StockDIAMONDBACK DB15 223 Rem/5.56 NATO 16in 30rd Purple Sports South Exclusive Semi-Automatic Rifle (DB175AK271)Magpul MOE gripMagpul MOE carbine stockA2 front sights only and an A2 flash hiderIncludes Magpul Gen M2 PMAG 30rd magazineMagpul MOE 7in M-Lok rail carbine-length with Magpul Vertical Foregrip ...$529.99
- In StockSPRINGFIELD ARMORY Saint Victor 5.56mm NATO 16in 10rd Flat Dark Earth Semi-Automatic Rifle (STV916556FPLC)16in Chrome Moly Vanadium BarrelSingle-Stage TriggerFlip Up Front and Rear Sights7075-T6 Aluminum ReceiverAdjustable Magpul Stock The SPRINGFIELD ARMORY Saint Victor Rifle is designed to offer ...$1,008.99
- In StockDANIEL DEFENSE M4A1 5.56mm NATO 14.5in No Magazine Flat Dark Earth Semi-Automatic Rifle (02-088-06027-067)LOWER RECEIVER: Mil-Spec with Enhanced Flared Magazine Well and Rear Receiver QD Swivel Attachment Point. CNC Machined of 7075-T6 Aluminum, Type III Hard Coat AnodizedUPPER RECEIVER: Mil-Spec with ...$2,236.00
- In StockDANIEL DEFENSE DDM4 V7 5.56mm NATO 16in No Magazine Flat Dark Earth Semi-Automatic Rifle (02-128-10290-067)Free-Floated Cold Hammer Forged Barrel for long term durability and superior accuracyM-LOK Attachment Points for weight reduction and optional modularityFull Length Top Rail for mounting optics of ...$2,060.00
- In StockDANIEL DEFENSE DDM4 V7 Pro 5.56mm NATO 18in No Magazine Cobalt Semi-Automatic Rifle (02-128-10739-067)Free-Floated Cold Hammer Forged Barrel for long term durability and superior accuracyM-LOK Attachment Points for weight reduction and optional modularityFull Length Top Rail for mounting optics of ...$2,353.00
- In StockFAXON ION Ultralight 5.56 NATO 16in 30rd Semi-Auto Rifle (FX5500)16" 556 Integral Barrel with 3-Port Brake - Meets NFA 16" minimum barrel length requirement Enhanced Forged Receiver Set w/ Tensioning ScrewGunner Lightweight BCG w/ Superfinish13" ...$1,402.99
- In StockFAXON ION-X Hyperlite 5.56 16in 30rd Semi-Auto Rifle (FX5516X)16" 5.56 Pencil BarrelSlim 3-Port Muzzle BrakeX-Tra Lite Forged Receiver Set w/ Tensioning ScrewGunner Lightweight BCG w/ Superfinish13" M-LOK Carbon Fiber HandguardMulti Position ...$1,447.99
- In StockRADICAL FIREARMS RF-15 Socom 5.56 NATO 16in 30rd Gray Rifle (FR16-5.56SOC-15RPR-GRY)MIL-STD upper and lower receivers15" RPR free float rail system for increased accuracy and cool handlingAmple space for accessoriesReliable performance for both new and experienced shooters ...$449.99
- In StockRUGER AR-556 MPR 5.56mm NATO 18in 30rd Storm Trooper White Semi-Automatic Rifle (08550)Lower receiver is fitted with Magpul MOE grip and MOE SL collapsible buttstock on a Mil-Spec buffer tubeHandguard is free-floated for accuracy and the slim, 15" length provides enhanced ...$847.99
- In StockRUGER AR-556 MPR 5.56mm NATO 18in 30rd Robin's Egg Blue Semi-Automatic Rifle (08551)Lower receiver is fitted with Magpul MOE grip and MOE SL collapsible buttstock on a Mil-Spec buffer tubeHandguard is free-floated for accuracy and the slim, 15" length provides enhanced ...$831.99
- In StockSPRINGFIELD ARMORY Hellion 5.56 16in 10rd FDE Bullpup Semi-Auto Rifle (HL916556FLC)The FDE finish is integral to the polymer, resulting in high-quality, long-lasting colorThe bullpup system moves the action and the magazine back behind the trigger, reducing the overall length ...$1,722.99
- In StockCMMG Resolute Mk4 5.56mm Carbine 14.5in P&W 30rd Armor Black Rifle (55A060B-AB)Muzzle device - Cmmg Zeroed SVD brake pinned and weldedCmmg Adjustable Ripstock; M-Lok Free Float handguard4140CM, SBN barrel material; Cerakote finish standardMk4 Zeroed parts and accessories - ...$1,357.99
- In StockCMMG Dissent Mk4 5.56mm Compact Action 14.5in P&W 30rd Armor Black Rifle (55AC10B-AB)Aircraft grade aluminum receiversPatented Compact ActionNon-reciprocating side charger - A forward non-reciprocating charging handle allows for quick and easy manipulation without coming off ...$1,955.99
- In StockKEL-TEC RDB 5.56 NATO/223 Rem 17.3in 20rd OD Green Semi-Auto Rifle (RDBGRN)Downward EjectionUnparalleled Trigger SystemPiston Operated Gas SystemBirdcage Flash HiderFully Adjustable PistonTwo Integral MIL-STD-1913 Picatinny RailsFully Ambidextrous Controls The RDB is a ...32% off$717.99$1,050.00
- In StockKEL-TEC SU-16E 5.56 NATO 16in Threaded Barrel 10rd Black Semi-Auto Rifle (SU16EBLK)Chambered for 5.56 NATOThreaded 16" barrelGas piston operatedAdjustable sightsPistol gripProprietary compact forend6-position stock The Kel-Tec SU-16E chambered in 5.56 NATO is a unique take ...$734.99
- In StockSIG SAUER MCX-Spear LT 5.56 Nato 16in 30+1rd Semi-Automatic Rifle (RMCX-556N-16B-LT-B)Black Anodized FinishLightweight Ergonomic M-LOK HandguardSIG Flatblade Match TriggerFully Ambidextrous ControlsInterchangeable BarrelsSIG QD Suppressor-Ready Flash Hider The MCX platform has ...$2,599.99
- In StockRUGER Mini-14 Ranch 556NATO 18.5in 5rd Semi-Automatic Rifle (5887)Stock: Laminated Brown/Black ChevronFront Sight: BladeRear Sight: AdjustableBarrel Length: 18.50"Material: Stainless SteelTwist: 1:9" RHCapacity: 5Finish: Matte StainlessWeight: 7 ...$1,079.99
Carrying the honor of being the new standard NATO rifle cartridge, 5.56 x 45 became one of the most popular rifle calibers on the market. It was developed on the base of the .223 Remington cartridge and even though the two are not entirely identical, they have similar dimensions. 5.56 rifles have less maneuverability than corresponding handguns, but the former are more numerous. Combining high velocity and magazine capacity with a small size and lightweight design, the 5.56 cartridge became a people’s champion for a reason.
Even though these two calibers carry different names, their story is closely intertwined. It all began with the development of the .223 Remington cartridge that was launched together with the development of a whole new lightweight combat rifle. U.S. Continental Army Command initiated the project to find an alternative to 7.62x51 rifles. Several famous gun makers were invited to participate, including Fairchild Industries, Remington Arms, and Winchester Arms. After two years of development, a .223 Remington cartridge (former .222 Special) was established. In 1963, it was officially accepted and named "Cartridge, 5.56mm ball, M193." In some seven years, NATO members decided to choose another standard caliber, a smaller one, that would replace 7.62x51mm. .223 Remington was chosen as a base for the future cartridge, and, with several changes, it turned into a 5.56 x 45mm cartridge. It had an unconditional advantage of light weight, allowing the soldiers to carry more ammunition for the same weight, in addition to high-velocity and small size.
Gritr Sports has many models of 5.56 assault rifles for sale. We sell firearms that bear the mark of quality of the most well-known gun makers. Here you can find 5.56 NATO guns, produced by such brands as Daniel Defense, Diamondback, Springfield Armory, Windham Weaponry, Black Rain Ordnance, Smith & Wesson, and several others. The variety is what we take pride in, so you will definitely find something to your liking.