I have a 2007(please correct me if i'm wrong on this) Proto Matrix Rail. It has all metal parts and comes with the stock frame. The only notable upgrade is the violent Series Scythe Trigger. It has a couple of scratches on the body from use, but other than that this thing shoots ropes. I will have pics up in a few hours.

Violent Series Trigger

Scratches
Price: 200 obo
Trades:
'High end' Mechanical Markers
Automags
Autocockers
No Mil-Sim please
Comparable electros (would have to be a little bit in my favor)
**Unfortunately i'm unable to add any money to a trade