Under-Barrel Attachments Jim Shockey Steel Eagle

It's all in the title.
I'm going to upgrade my scope, and want a bipod attachment for the rifle but can't find a pica tinny adapter to go under my gun except an attachment that fixes on the barrel. This means that when I lay down I put extra stress on the barrel of the gun. 
Any tips for putting a bipod on my Steel Eagle ?

Thanks much, love the community