Finally got my M4 back together after much wailing and gnashing of teeth over barrel lengths and nut threads!
I present my Strike Back Stonebridge-esque impression:
Assuming you can make it out in the background clutter!
Laser is sat being all redundant as unfortunately the gun is front wired (plus the battery space in an MOE stock is nonexistent) so I've had to use a PEQ box (not strictly canon for a SB Stonebridge M4 but there you go - needs must). Torch is around somewhere but I'm waiting on a new short scout troch to go instead.