Airsoft Arizona

Airsoft Hardware => AEG's => Topic started by: Major Buttnuts on July 29, 2002, 12:34:53 PM

Title: spring power
Post by: Major Buttnuts on July 29, 2002, 12:34:53 PM

I recently upgraded a lot of parts in my gear box like aluminum piston, silent head set and a few others.  However, I also upgraded to an M120 spring in my MP5, and the fps is only a little over 300.  I thought an M120 was suposed to be at 350 or more, So I was wondering if you guys have any advise as to why the fps is so low and what I can do to bring it up.