The intent is to suppress every M4, M4A1 and M27 in the infantry community,
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Do they need sub-sonic ammo to make the suppressor effective?
No. The utility of a combat suppressor is reduced operator noise level. This allows more effe to be non- electronic/radio communications.
When a dozen or so automatic and semi automatic weapons are firing on close proximity leaders and warriors are effectively disconnected. Hand and arm signals are useful only if seen.
As a mostly deaf former infantryman and dapper, I can attest to the benefit of better verbal nonradio come.
Ecen if all members of a unit are muff and radio equipped it would benefit their tactical capability.
Sub sonic ammo means short range/limited capability. Sonic ammo is not hindered and even helped a bit holistically by suppressor use.
Dapper=sapper