Hatfield SA 12ga pistol grip stock/tube extension

[xman881166]

Hello,
Just bought this Hatfield semi auto 12 gauge shotgun. I am wondering what pistol grip butt stock and tube extension are compatible with this model?

 

[SOAB]

I don't believe there is much of anything for these guns so far. You may want to see if anything from tristar's semi autos may work.