Safety & Maintenance Instructions

DDM4
®
/ DD5
®
MANUAL P 15
4.1.1
300 AAC BLACKOUT FIREARMS
WARNING: NOT ALL AMMUNITION WILL PRODUCE THE SAME RESULTS.
All Daniel Defense rearms chambered in 300 AAC BLACKOUT are designed to
function with a variety of brands and types of factory-manufactured ammunition in
the appropriate caliber. These platforms were designed to be shot suppressed and
unsuppressed utilizing various types of supersonic and subsonic ammunitions. Many
subsonic types of ammunition are designed to be red in conjunction with a sound
suppressor. Testing indicates ring certain types of subsonic ammo without a sound
suppressor can lead to failure-to-cycle issues and is not recommended.
4.1.2
DDM4ISR
®
AMMUNITION SELECTION
RELEVANT TERMS:
SPEED OF SOUND: Approximately 1,126 feet per second (depending on altitude,
temperature, humidity, etc.)
SUBSONIC AMMUNITION: Ammunition loaded to travel slower than the speed
of sound
SUPERSONIC AMMUNITION: Ammunition loaded to travel faster than the speed
of sound
MUZZLE FLASH: The visible light produced by the combustion of unburned
gunpowder mixing with ambient air
MUZZLE BLAST: The sound of escaping gases after the bullet leaves the barrel,
produced by the gunpowder, which causes the “report” of a gunshot
BULLET CRACK: The sound associated with the collision of the shockwaves created
by an object traveling through the air faster than the speed of sound
WARNING: NOT ALL AMMUNITION WILL PRODUCE THE SAME RESULTS.
The DDM4ISR chambered in 300 AAC Blackout is designed to function with a variety of
brands and types of factory-manufactured ammunition in the appropriate caliber, loaded
to both supersonic and subsonic velocities. The DDM4ISR’s integral suppressor is very
effective at reducing both muzzle blast and muzzle ash. The other sound component
sometimes found in gun shots is the “crack” of a supersonic projectile, which cannot be
reduced by any silencer or suppressor. Ammunition for the 300 AAC Blackout and .300
Whisper can be purchased, usually around 190-220 grains, which are loaded with
a powder charge that accelerates the projectile to just under the speed of sound.
Subsonic 300 AAC Blackout ammunition often produces the best reduction in perceived
sound in the DDM4ISR platform. Supersonic 300 AAC Blackout ammunition generally
utilizes projectiles from 110 grains and up, accelerated to speeds faster than that of
sound. Supersonic ammunition often offers a atter trajectory and delivers more energy
to the target.