Just got myself a CM G18 (it's identical to the NBB TM one) and really, really like it. I've already got rails and a tracer coming on, but was looking at some other upgrades from guides I found and discovered some problems. Apparently most optical upgrades for this gun have long since been discontinued and aren't really available anywhere.

Basically I'm looking for some gripplates like these but in stock. Unfortunately that is the only store that I found that even mentions it. It's similar for some other parts like slides or a metal magazine end (the one store I found carried it for a price identical to that for the gun).

Can anyone point me somewhere where I might still get some stuff?

Also, are there any guides on internally upgrading it? I only found a few links and they are old and long since gone.