Core Rifle Systems Core15 5.56mm Upper/Lower Receiver Set High Quality Military Specification ...
Core Rifle Systems Core15 5.56mm Upper/Lower Receiver Set High Quality Military Specification Hammer Forged 7075-T6 Aluminum Hard Coated Anodized Matte Black
No Sale To California: No Sale To California CORE15™ Lower Receivers are High Quality Military Specification Hammer Forged 7075-T6 Aluminum, Hard Coated Anodized Matte Black, .223/5.56 or Multi Cal.
CORE15™ Uppers are : CORE15™ Mil-Spec Forged 7075 T-6 Aluminum
M-4 Upper Receiver with M-4 Feed Ramps
1913 Picatinny Rail Flat Top
Hard Coat Anodize Type III Class II
Black Finish
Dry Lube Internal Finish
Laser engraved T-markings
CORE15™ Lowers are : Machined from FORGED
7075-T6 Aluminum
Machined Chamfered Edges
Chamfered Magwell for improved reloading speed
Hard Coat Anodize Type III Class II
Black Finish
Chevrons machined into Magwell
Bullet Pictogram safety markings
Lifetime Manufactures Warranty
Caliber Dictionary
The Below Information Has Been Provided From Our Gun Caliber Dictionary And Is Meant For Informational Purposes Only. It Is Not Intended to Describe The Unique Specifications For This Ammunition.
The 5.56X45mm NATO cartridge was designed by James Sullivan, a member of Eugene Stoner's engineering team that developed both the M16 rifle and its original cartridge. The 5.56X45mm NATO was adopted by the U.S. military in 1964 and by NATO in 1980. With bullet diameter of .224-inch, the original M193 military cartridge used a 55-grain bullet at 3250 fps; the current M855A1 cartridge, developed by FN, uses a 62.5-grain bullet at 3020 fps, offering greater range and better penetration. The civilian version of the 5.56X45mm is 223 Remington; the cartridges are dimensionally identical but military chamber dimensions and specifications for military brass are different. It is considered safe to use 223 Remington ammo in a 5.56X45MM NATO chamber, but not a good idea to use 5.56X45mm ammo in a rifle specifically chambered for the 223 Remington. Although the stopping power of .22-caliber bullets remains controversial the 5.56X45mm has served well in now multiple generations of M16 rifles. — Craig Boddington
