What Tube Extension, Spring and Buffer do I use for a .308 Rifle for MagPul PRS Stock?

[Variable Alpha1]

I have a Sig Sauer 716 3-Gun-Heavy rifle with an 18" barrel. it has a 6 position Carbine tube extension and carbine Buffer and a flat coil spring system. I would like to take off this Carbine stock set-up and install a .308 MagPul PRS stock onto the Lower Receiver.

Now what Tube Extension, Spring and Buffer should I use for this Piston Rifle? Will a standard 5.56mm A2 tube, buffer and spring work? Or should I get a better more precise tube extension, spring and buffer designed for the .308 round? If so then which one would you recommend?

Thanks for your help.

 

[wareagle700]

Standard rifle tube
.308 rifle spring
.308 rifle buffer

 

[Roentgun]

There is also the LMT DRM stock that slides directly onto the carbine tube. I'm not entirely sold on it yet, but it is an option.

ETA: kind of a ripoff of the PRS, curious as to why Magpul didn't think of this first.