RT On/Off Assembly

[Rusty_Skater345]

I was wondering what exactly a RT on/off Asembly is, and why is it is considered an upgrade on the RT ULE, basically i would like to know what an on/off assembly is.
Thanks

[soccer4minimags]

it is just what it says on/off. Its a small pin in what looks like a small valve, the sear raises up and activates this pin on or off, which holds air back or releases it.

Its not considered an upgrade. You are required to have some sort of on/off, your mag will not work without it.
You have to choose ULT, or regular. The ULT is an upgrade and costs $19 more where the regular rt on/off would be included stock with the valve if you do not select the ULT.

Hope this helps