For: RA Tech NPAS for WE M4 Gas Blowback Airsoft Rifle Series
this is great! if you have a WE M4 and you know how to strip it then buy this. It allows you to change your FPS from 100 to 570 which is great because you can change it on the fly, fast and easily. Mine didn't come with instructions so i had to look on YouTube
easy to install
allows rapid FPS change
better than the stock adjuster
not good if you don't know how to strip your M4
mine didn't come with instructions
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