Here is a semi-comprehensive list of what is included in the SOPMOD Block II program. These are ISSUE-ONLY, not including private purchase by operators.
-10.3\" or 14.5\" M4 or SOCOM contour barrel
A rifle equipped with a 10.3\" barrel will have a 9.5\" DD RIS II in FDE(referred to as MK18 Mod 1)A rifle equipped with a 14.5\" barrel will have a 12\" DD RIS II in FDE(commonly referred to as a \"Block II\")Flash Hider:
-A2(standard flash hider)-KAC NT4(design for use with KAC NT4 suppressors)Rail System:-Early Block II M4A1s still used the KAC M4 RIS(referred to as Block 1.5, usually includes mixture of Block I and II accessories)-Daniel Defense RIS II(Flat Dark Earth) in 9.5\" or 12\"
Vertical grips-Tango Down grip(tan)-KAC-Grip-Pod
Rail panels:-Tango Down-KAC
Optics:-Elcan Specter DR SU-230-EOTech SU-231-PEQ (EOTech 553)-ACOG SU-237 (TA01-ECOS)-Older SOPMOD Block I optics (TA01NSN, ECOS-C, older EOTechs) have also been seen on Block II rifles-EOTech/Aimpoint 3x magnifiers
IR Lasers:-Insight AN/PEQ-15Flashlight:-Insight M3 (SU-233/PVS)-Older SOPMOD Block VBL\'s like the Surefire M951 or Surefire Scout have also been seen in use
Buttstock:-standard M4 (both older CAR style and newer \"LE\" style)-LMT SOPMOD
Rear sight:-KAC 300m(rear)-KAC 600m(rear)-MaTech(rear)-KAC flip up(front)-standard triangle sight/gas block(if using earlier Block 1.5 with KAC RIS)