Airsoft Canada - View Single Post - Pros & Cons of Upgrading the TM Thompson M1A1

FNG · October 21st, 2005, 01:13

The spring charts I've looked at say the 'SP120' should get you about 425 fps. SP100 around 385 fps. I've installed several SP100 springs in various guns with everything from stock to Systema Helical gears. They all fire around 340 to 365 fps. How could the SP120 make that far of a jump? If someone has a better spring to recommend I'm all ears....or eyes...whatever.

October 21st, 2005, 01:13	#3
FNG Trader rating Join Date: May 2005 Location: Toronto	The spring charts I've looked at say the 'SP120' should get you about 425 fps. SP100 around 385 fps. I've installed several SP100 springs in various guns with everything from stock to Systema Helical gears. They all fire around 340 to 365 fps. How could the SP120 make that far of a jump? If someone has a better spring to recommend I'm all ears....or eyes...whatever.