on/off assy.

[AnArchist_1944]

do i need this (http://store.airgun.com/index.cfm?fuseaction=catalog.prodInfo&productID=205&categoryID=24) on/off assy for my X-Valve if iam making my gun into an E-Mag or can i use my stock on/off that came with my X-Valve or better yet can i use my ULT for my X-Valve if i E-Mag my Mag

[AnArchist_1944]

need this info quick please

[Dayspring]

If you're using an Emag rail, you need that .712 assembly.

[AnArchist_1944]

what if iam useing the Karta rail.

[Dayspring]

The karta rail had to start off as something... RT Pro or Emag?