My PTW/CTW/FCC is built on a Celcius upper and lower body and outer barrel, the FCC gear box, hop unit and electronics along with a Systema cylinder and PDI inner barrel work well.
I have had no issues with fitment of FCC parts, they are top notch,
Originally Posted by SuperHog
Ever since I got into this sport, a Systema has always been my dream gun, and after owning so many VFC, G&P, and a few TM guns, may be ready for one.
But I have also been following the FCC posts and more interested because FCC has gone beyond Systema.
My big question is, are FCC internals interchangeable with Systema parts or FCC has complete developed their own standards?