Update: The new c-clip hopup unit for M249: Tension spring is no longer needed. Put barrel assembly together and insert it into the body(maker sure your set screw on loading brass chamber is removed(pic 2). Once You push the barrel in maire sure the hopup unit goes all the way into the main kit(pic3). Put the screw back on, 2mm Allen key(pic4). This helps you to stable the hopup and improve the feeding. Also we are working on something else around feeding tray area to allow a better feeding.
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The new c-clip hopup unit for M249:
Tension spring is no longer needed.
Put barrel assembly together and insert it into the body(maker sure your set screw on loading brass chamber is removed(pic 2).
Once You push the barrel in maire sure the hopup unit goes all the way into the main kit(pic3).
Put the screw back on, 2mm Allen key(pic4).
This helps you to stable the hopup and improve the feeding.
Also we are working on something else around feeding tray area to allow a better feeding.
Credit to Peter Lee