Best ring setup for PE-90 Flattop

[gorky]

Having some trouble finding what rings people are using for their flattop PE-90s. I am wanting to mount something with a 40mm bell w BC Flip-up protector. Any good suggestions ? I would like to avoid using a cheekpiece if at all possible.
Thanks guys

 

[teddy49]

I use ARMS 22 low rings on my carbine. But I'm not sure if they'd work with a 40mm bell