Ciener conversion kits

[mtsusean]

for an M4,

use which kit?

AR15 Unit

or

M16 Unit

[hatt]

Unless you have a legal/registered M4 "machine gun," and you would know if you did, you need the AR15 kit.;)

[sff70]

Several pertinent threads in the "pistol cal ARs" section of the forum.