tanaka fps problem

Hi guys, I bought M700 AICS Tanaka without PCS and these new parts: G&G Rubber Air Seal Set for Tanaka / KJW M700 Airsoft Sniper Rifle G&G Gas Route Connector Spring for Tanaka M700 / M24 G&G Valve Knocker for Tanaka M700 / M24 G&G Striker Spring for Tanaka / KJW M700 First 250 shots were...