CA RIS Kit & 9.6V Stock Kit on TM M4

[Vigil]

I was wondering if the CA RIS kits (barrel included) and the fat triangular stock that holds a 9.6V battery will fit on a TM M4.

I asked the CA shop, they say it all fits 'perfectly', but I'm getting mixed msg's from friends as to how reliable their advise is.

I'm concerned about the three main areas:

1) Where the barrel slots into the main body (inside)
2) Where the RIS screws onto the main body (outside)
3) Where the stock inner arm screws into the main body

Anyone know if the parts are interchangable btwn the two companies?

If so, I save about 40% from having to buy the G&P sets...