[Paco]

Generally, a PDI 170 = M120

I use PDI 150 Pro springs in most of my AEG's.  I have one in my SR-16 and it fires at approximately 370 FPS, though for some reason this is a bit higher than other guns I have put a PDI 150 in...  on average, it *should* be about 360 depending on the barrel length of what you put it in.

[Paco]

I'd *guess* it would put your AUG at about 375 FPS with a tightbore barrel.  I put a PDI 170 in my aug with a tightbore barrel and had to remove it because it was firing at ~420...  so I put a 150 in and it dropped it to ~375.

[TheCrow]

I am going to put a PDI 150 spring in one of my AUGs.  Can anyone give me a "best guess" estimate of what my expected FPS will be?  The only other velocity-affecting part will be a Systema BS barrel.

Thanks,

-The Crow