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PDI 150% AEG Upgrade Spring. ( 150 %: ~350 F.P.S.)

1 Customer Review

by Andrew H. on 11/22/2008
"EXCELLENT SPRINGS!! PDI makes very consistent springs, and they work well, but BEWARE! These FPS guides are inconsistent in my experience... I have a PDI 170 spring in my M4, and am getting 415 to 420 FPS w/ .25's!