I made a support weapon out of my SR16.
Hurricane reinforced mechbox
Systema extra hard steel bushings
Systema ultimate torque gears
Systema tightbore
Systema silicone piston head
PDI 150%
8.4v 3000mah battery
backup 9.6v (x2)
M4 carry handle
Z rail
Rockmount bi-pod on harris adaptor
Hero Arms Cmag
Get the auto-winding.
a note, Apoc has 4-5 cmags and has had problems with extended use. the auto winding gears are plastic and tend to get chewed up over time.
The V2 internals of the SR16 dont take lightly to extended cmag use.
The fields where I play dont allow for Cmags anymore, so I sold mine to wiseowl.
fun, but know what your getting into.
also, makes it rather uncomfortable to hold as you have to reach around the Cmag.