ID: 26261 (SPR-STMA-M140)
Systema M140 Irregular-Pitch Airsoft AEG Power-Up Spring (450~500 FPS) Manufacture:
"I got this and install it on my biodynamic m4 .. awesome !! Shoots 493-503 .. real good..
After three games it shoots 470-480. . I hope it stays there..
"ya it may look slow but you need to crono it before you dis it its systema you probly didnt install it right it dos do 450-500 475 is the middel ground that most people get
"its alright probably not 450- 500 fps because it looks alot slower when you fire it maybe 390 fps over all pretty good if you got the matrix m14 you need this
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