Browse through all M4A1 assault rifle skins inside Delta Force here and find out how to get the skins.
M4A1 - White Rose
Unlock this skin: White Rose Bundle.
M4A1 - Dark Sentinel
Unlock this skin: Dark Sentinel Bundle.
M4A1 - Gokenin
Unlock this skin: Gokenin Bundle.
M4A1 - Subrosa
Unlock this skin: Research - Subrose.
M4A1 - Spectrum Blitz
Unlock this skin: Spectrum Blitz.
End of Delta Force M4A1 Skins list.