CALIBER: 5.56 mm, manufactured at the Lake City Army Ammunition Plant (LCAAP)
CASE: Brass (Copper Alloy No. 260)
BULLET: 55 gr. FMJ Boat-Tail
PRIMER: M41 Operating Range: (-40 degrees to +125 degrees F)
PRIMER SEALANT: Water resistant lacquer
CASE MOUTH SEALANT: Yes
CASE KNURL: No
HEADSTAMP: Each loaded cartridge shall be headstamped with the manufacturers symbol and year of manufacture
ACCURACY: 3-10round groups not to exceed 2.00 inch mean radius maximum average at 200 yards
INSTRUMENTAL VELOCITY: 3165 +/- 40 FPS (78 feet from muzzle) using a 5.56 test barrel, 20 inches long
ENERGY: 1223 Ft-Lbs. at 78′
CHAMBER PRESSURE: Piezotronic maximum average per 10 rounds – 55000 PSI in 5.56 test barrel (case mouth location)
BULLET PULL: Minimum individual 35 lbs.
PROPELLANT DETECTION: 100% mechanical/electronic detection of propellant levels within the cartridge
VISUAL INSPECTION: 100% visual inspection of finished cartridges prior to packaging
WARNING: For use in standard 5.56 mm chambers. Do not use in .223 chambers.