Retro Arms CNC Machined Custom Selector Switch for M4 Series Airsoft AEGs
(Color: Silver)

"It fits well with my Madbull Noveske lower receiver. It looks really good with my speed blade trigger. My thumb can select and grab quicker. The only issue i ran with was when i tighten the Retro Arms screw it will lock up, meaning i couldn't select the firing mode.
To solve this issue i had to trim the original spring to make it loose.
Pros
long enough
light
makes the gun different
Cons
had a hard time alining the screw
some springs would not work (trimmed)
I would wish retro arms make their own spring kit and metal nub.

All in all, i would recommend it to anyone who wants there AR-15 to be "different". It works with my selector plate Safe, SEMI, and AUTO works fine and i made sure the circle part (where the selector is screwed in) was similar to the original.

"Good switch did not come with spring wish the black part was metal, it's plastic that could wear out

"Will it work with the the valcan asl mod m and nexxus hpa engine