Quote Originally Posted by DOIDY1 View Post
Hi all can you help .I have a 75 original recoilless 6 mtr mach .is it possible to increase the power with a deferent spring so could use it for field target
The compression chamber is too small, don't bother. FWB300 Match rifles can be boosted a bit, to 7.5 or 8.5 ft/lbs. Sell it and get a Prosport.