This is for M16, XM16E1, M16A1, XM177 series, M16A2, M16A3, M16A4, M4 and M4A1. And just maybe in the future M1 Garand.
M16-20" 1/14 or 1/12 twist bbl. 3 prong FH, A1 carrying handle slick side upper Lower No fence Safe/Semi/Auto
XM16E1/M16A1- 20" 1/12 twist, 3 prong/birdcage FH, A1 carrying handle w/forward assist, Particle fence, Safe/Semi/Auto
XM177 series-11.5" 1/12 bbl with sound moderator/P&W long FH, A1 upper with or without FA, lower particle fence, Safe/Semi/Auto
M16A2-20" 1/7 twist bbl, A2 FH, A2 carrying handle w/FA and brass deflector. Lower fenced, Safe/Semi/Burst
M16A3-20" 1/7 bbl, A2 FH, upper A2 or A4 flattop, Lower fenced, Safe/Semi/Auto
M16A4-20" 1/7 bbl, A2 FH, upper rifle ramped flattop. Lower fenced, Safe/Semi/Burst
M4-14.5" 1/7" bbl, A2 FH, upper A2 or M4 flattop, Carbine ramp, Lower fenced, Safe/Semi/Burst
M4A1-14.5" 1/7" bbl, A2 FH, upper M4 flattop, Carbine ramp, Lower fenced, Safe/Semi/Auto
SOCOM Block 1-M4A1 upper/lower with KAC RIS/RAS handguards and KAC NT4 FH, Block I accessories
SOCOM Block 1.5-M4A1 upper/lower with DD RIS II handguard, SF 4P FH and Block 1 accessories. Can be 10.3"/14.5" 1/7 twist bbl. Govt Profile or SOCOM
SOCOM Block II-M4A1 upper/lower with DD RIS II handguard, SF 4P FH and Block 2 accessories. Can be 10.3"/14.5" 1/7 twist bbl. Govt Profile or SOCOM. MARSOC will use NT4 FH
Mk18 Mod 0/CQBR-10.3" 1/7 twist, A2 or NT4 FH, M4A1 upper, KAC RIS/RAS handguard, M16A1/M4A1 lower
Mk18 Mod 1-Navy marked SOCOM Block II
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