Looking for locking pieces and rollers, plus all the assorted other wear items on the G3. Maybe even parts kits. I know there is RTG, and HKparts but any other good places to look for parts at?
Apex Gun Parts, Centerfire Systems, Numrich, and Sarco all have a fair number of G3 parts in stock, but I'm not sure who has the specific parts you're looking for.
Sometimes Midway has some G-3/PTR-91 items and CTD can surprise, they had awhile back some steel and AL Mags for $2.97 either type. The parts supply since 2013 has been an on again/off again situation. I waited almost a year to get a HK style bi-pod for the wide handguard with RTG having the good price at $80 ( but out ) HK Parts in stock but wanting $400. It pays to shop around. Oh these guys also stock some parts HK G3 Parts and Accessories - Keepshooting® . Google can be your friend also poke around this forum HKPRO Forums for info.
Hope this helps
Jump62
aka Paul