What Nub to use with SRS TNT bucking

[Allen428]

I’m currently using a fast hop TNT barrel and a TNT TR-hop bucking but unsure what nub to use with this set up, I was going to get a prowler nub but seen people have had problems using it with the tnt bucking. Anyone using this set up and what nub do you use?

[Steveocee]

Something concave is best. From what I've been told about the TNT rubbers they have Loooooong contact patches so a concave is a must.

I'm using one with a H-Plate in one of my pistols currently.

 

[P13]

I use the pantera arm and nub in my vsr with tnt rubber and barrel, works very well but unsure if the same combo is available for the SRS