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For: Modify M4/M16 1-Piece Metal Hop UpProduct Information:
These hopups are amazing. I use these and ProWins in all of my M4s. Never let me down once, never had problems with mine. Love it. Best side-wheel M4 hopup on the market IMO.
-Good quality materials.
-Good seal with bucking
-Stays on the barrel and has no wiggle or wobble
-Comes with two arms, normal arm and nub arm
-Doesn't lose its hop or arm position after shooting for a while
-Hop up arm and nub stay in place due to a better arm design over standard hopups
-Better than the MadBull hop up by far!
-Best side-wheel style M4 hopup on the market IMO
-Had to make the rails on the sides of the unit a little skinnier to fit my VFC. But it'll fit others without modification. So no worrys, I don't mind it anyway.