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Old June 1st, 2009, 15:36   #9
m102404's Avatar
Join Date: Apr 2006
Location: Toronto
Chrony it first. 2 of the last KA's that I've seen came out at 351fps w/0.20's with the hopup off. The one before that was 330fps...I added a tightbore, better spring guide, air-seal nozzle and it's bang on 350fps with the stock spring. With a M110 spring it's bang on 390-ish.

That's just about as close as you can get but still be under the generally accepted indoor/cqb 350FPS Maximum Limit.

If you're shooting 330fps the range/distance that you'll pick up by adding 19fps will be minimal. 10-20 feet is the matter of 3-6 big steps...

If you're shooting 300...the 35-49 fps that you'll pickup with a stiffer spring is noticeable. The difference between 330-ish and 380-ish when outdoors is noticeable.
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