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The intent is that the tracer matches the ball round well enough for the purposes of machinegun fire. 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
It appears that this round can drastically improve the performance of any AR-15 weapon chambered to .223/5.56 mm. Superior accuracy, wounding capacity, stopping power and range have made this the preferred round of many special forces operators, and highly desirable as a replacement for the older, Belgian-designed 5.56×45mm SS109/M855 NATO round.
If different ammunition types were used in the segment, they were alternated (for example, A–B–A–B–C rather than A–A–B–B–C), with the tracer round (C) at the end. Usually one round in five or ten was tracer, to show the gunner the trajectory; pre-War belts used a 1-in-10 mix and War and Post-War belts used a 1-in-5 mix.
MIL-L-63532C stipulates that the force to strip a NATO approved round from the M27 link should be between 5.5 and 16 lb f (24.5 and 71.2 N) and the belt should have a minimal tensile strength of 33 lb f (146.8 N). A single M27 link weighs approximately 2 g (30.9 gr). [4]
Tracer bullets do not fly quite the same trajectory as ball, and the weapon's sights must be used for accurate fire—particularly at ranges in excess of 800 meters, where 7.62×51mm NATO tracer bullets usually burn out and are no longer visible. This is a problem for all weapons in this caliber using this tracer round.
An M27 disintegrating belt loaded with 5.56×45mm NATO M855 Ball and M856 tracer ammunition being fed into an M249 light machine gun Many modern ammunition belts use disintegrating links. Disintegrating links retain a single round and are articulated with the round ahead of it in the belt.
NATO chose a 178-mm (1-in-7) rifling twist rate for the 5.56×45mm NATO chambering. The SS109/M855 5.56×45mm NATO ball cartridge requires a 228 mm (1-in-9) twist rate, while adequately stabilizing the longer NATO L110/M856 5.56×45mm NATO tracer projectile requires an even faster 178 mm (1-in-7) twist rate. [8]
Solid copper bullets typical of the majority of nonlead ammunition certified for hunting in California. [1] The .25 caliber (6.4 mm) bullet on the left has a small cylindrical cavity in the nose, and the .35 caliber (9 mm) bullet on the right has a larger cavity holding an aerodynamic plastic tip .