For: Lonex Steel Enhanced Ball Bearing Spring Guide (Ver. 3)Product Information:
Doesnt work in the umarex sportline version which has a quick change spring. Maybe if you dremel some of the teeth off itll work in it but oh well. Itd be sweet if it worked ghis thing has like zero resistance when its spinning so i amagine itd work awesome.
Very little resistance in the bearings
Doesnt work in my aeg:(