The back block won't interchange. the Illusion block I think is pressed in, and the Cocker one is threaded. AFAIK the only interchangeable parts on the gun are the barrel and the detent.
Huge obnoxious sig line!!!
" dude this hk sticker made my gun shoot like 26 bps it was teh shizz" :dodgy:
"I was an instant genious when i started paintball" :dodgy: