[CDN_Stalker]

Ya, I know ther was a thead about this at one point, couldn't find to bring back up again, so I am starting a new one.

Ok, I've tried two different PDI springs in my MP5, both push a .2g BB about 360fps W/O hop up. One teammate had a PDI 150% spring put in his SR-16, it shot about 415fps WITH hop up on! Another, I was the one who installed the PDI 150% spring, it now shoots about 390fps with hop up. People have been wondering WTF is going on with the PDI 150% lately, and while I CAN'T explain, I have found out the way to tell what is a real 150%, and what isn't.

The real PDI 150% spring measures 6 3/8" long. It puts out (as said, 360fps in my MP5 without hop up, and set for .2g, 340fps). I have a TM G36 apart now, ready to put in a PDI 150% spring the owner bought, and check it out, it's longer than the spare one I have. I measured it, it's 7" long. Compare the two, and there is a visual almost 1" difference in length!!!!!

This is the ONLY reason I am posting this, is because I just found out how to ID "HOT" 150% springs (which could put one over the field limits of most fields for an AEG) and how to ID a true PDI 150% spring.

Thought that might help out those that want a reasonably mild upgrade, to roughly 350fps, yet end up with field "illegal" guns.

As far as I know, a stock spring (~280fps) is what PDI might consider to be a 100%, am I correct? And a 150% spring would in theory, add another half on top of that, aka 140fps. So in theory, a PDI 150% spring would add up to roughly 420fps, NOT 350fps. Looking for added info from the experienced in this area. I feel this is a pretty important topic/observation!