|| verified buyer
For: Echo 1 H Shape Hop Up Spacer Pack (2 in one pack)Product Information:
Very good replacement nubs. All AEGs' nubs should be replaced with H-nubs to increase accuracy, range, and consistency.
Installed on my KWA M4 and Echo 1 G36C, and they both perform wonderfully with this upgrade installed.
Just a note, the white nub is for setups less than 330 FPS and the black is for more than 330 FPS.
Increases accuracy, consistency, and range
White one can easily get lost on carpet
The white nub is most likely useless to most people