Silverback MDRX Hop Up Replacement Nubs

Silverback MDRX Hop Up Replacement Nubs Low nub, for adjustments ranging from 0 up to 750 ?m (standard bbs configuration) High nub, for adjustments ranging from 500 up to 1250 ?m (heavy bbs configuration) Suitable For Silverback MDRX Series Electric Gun AEG Airsoft Rifle