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SOUND SUPPRESSOR MODEL MK-9K
AMMUNITION NOTES
Never use ammunition that does not meet SAAMI specifications.
All commercial American made SAAMI specification ammunition is safe,
but the origins, storage history, and reason for being surplussed of foreign
made ammunition is not available for evaluation. Although foreign made am-
munition is usually safe, this is not always the case. Damage from non-
American ammunition cannot be covered under warranty.
The majority of 9mm ammunition is supersonic, and the projectile trav-
eling at velocities above 1,100 fps will produce a ballistic "crack" or "sonic
boom". There are several commercial sources of specially loaded subsonic
9mm ammunition, and for maximum effectiveness, we suggest the use of
this type ammunition. Although special 9mm subsonic ammunition has a
bullet muzzle velocity below 1,100 fps, the higher bullet weight results in a
significantly higher bullet kinetic energy.
The majority of subsonic 9mm ammunition is loaded utilizing bullet
weights of 147 grain or heavier. Subsonic ammunition utilizing bullet weights
of 155 grain or more is apt to be significantly overpressured in some weap-
ons, especially the HK MP5. 147 grain FMJ and JHP bullets for 9mm reload-
ing are available from a variety of suppliers, including Hornady and Speer. Do
not use cast lead bullets. Loading data for 9mm subsonic ammunition is
available from a number of sources, including the Speer Supplement (avail-
able from Speer for their 147 grain TMC bullets), and from Accurate Arms for
use with their powders. However, we caution against any attempt to hand
load beyond recommended SAAMI specifications.
Commercial subsonic ammunition is available in 158 grain FMJ from
Israeli Military Industries and in 147 grain bullet weight from Winchester,
Remington, Federal, CCI, and others in both full metal jacket and hollow
point styles. We have found that although this ammunition remains subsonic
in pistols, it may not remain subsonic in the longer barrel of the Heckler &
Koch MP5 submachine gun. The user will need to experiment with different
brands. Ammunition with bullet weights over 154 grains is discouraged by
H&K. Although some have suggested that the 9mm subsonic cartridge is
"downloaded," we believe users should be aware that this ammunition is
anything but an anemic load with kinetic energies and pressures signifi-
cantly greater than standard 9mm ball ammunition.
Use of corrosive ammunition, and evidence of its use, will void the war-
ranty.
WARNING
P. 7
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