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The Enhanced Performance Round was made to nearly match the trajectory of the M855 to aid in training consistency—the SS109/M855 ballistic coefficient (G7 BC) of 0.151 was improved to 0.152 for the M855A1 [143] —but the ranges to get desired effects are greatly extended.
The lead-free cartridges also reduce environmental impact by removing more than 2,000 metric tons of lead per year that otherwise could end up in the environment. [ 18 ] [ 19 ] The EPR contains an environmentally-friendly projectile that eliminates lead from the manufacturing process in direct support of Army commitment to environmental ...
In June 2010, the U.S. Army announced it began shipping its new 5.56 mm, lead-free, M855A1 Enhanced Performance Round to active combat zones. [157] This upgrade is designed to maximize performance of the 5.56×45mm round, to extend range, improve accuracy, increase penetration and to consistently fragment in soft-tissue when fired from not only ...
An NSN on the tag of a pair of trousers. A NATO Stock Number, or National Stock Number (NSN) as it is known in the U.S., is a 13-digit numeric code used by the NATO military alliance, identifying all the 'standardized material items of supply' as they have been recognized by all member states of NATO.
M27 links connect up to 200 5.56×45m NATO rounds (4 × M855 ball : 1 M856 tracer) contained in an ammunition box used to feed a M249 light machine gun. The M856 tracer cartridge (63.7-grain bullet) is used in the M16A2/3/4, M4-series, and M249 weapons (among other 5.56mm NATO weapons). This round is designed to trace out to 875 yards, has an ...
The SPR is not used to fire standard issue 5.56mm M855A1, M193 ball, or M856 tracer ammunition. [11] Due to the limits in terminal performance and relatively poor accuracy of the 62-grain (4 g) M855 ball, the Mk 262 Open Tip Match (OTM) round was developed and manufactured by Black Hills Ammunition as a more accurate
Close-up of L85A2 with Magpul Industries EMAG polymer magazine with clear viewing window. The STANAG magazine, while relatively compact compared to other types of 5.56×45mm NATO box magazines, has often been criticized for a perceived lack of durability and a tendency to malfunction unless treated with a level of care that may not be practical under combat conditions.
Action Time here means the (short amount of) time required between the ignition of the primer and the projectile leaving the barrel. This is a comprehensive procedure for testing ammunition using state-of-the-art instruments and computers.