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Mongoose · January 29th, 2007, 10:18

A Systema 250% spring will cause havoc for you gearbox and the rest of the internals. If by chance you were able to get it to work using a reinforced gearbox and all...it'll be shooting way to hot for any field, unless you were making a home made sniper rifle. I had a Sun Project M40A1and I had the reinforced bolt installed. I installed a PDI 200% spring and was using .25g bb's, it was chronied around the 480-490 fps. I also had a PDI 300% spring of which I never used due to the fps were way over the allowed 500 fps limit for sniper rifles.

January 29th, 2007, 10:18	#8
Mongoose Trader rating Join Date: Dec 2001 Location: Medicine Hat, Alberta	A Systema 250% spring will cause havoc for you gearbox and the rest of the internals. If by chance you were able to get it to work using a reinforced gearbox and all...it'll be shooting way to hot for any field, unless you were making a home made sniper rifle. I had a Sun Project M40A1and I had the reinforced bolt installed. I installed a PDI 200% spring and was using .25g bb's, it was chronied around the 480-490 fps. I also had a PDI 300% spring of which I never used due to the fps were way over the allowed 500 fps limit for sniper rifles. __________________