Re: Scope base and rings for new DPMS SASS
I think that Badger makes an adapter for 18 or 23 MOA, something like that. I never quite understood why it wasn't an "even 20" but that's besides the point, it exists and it has a positive reputation and a good track record.
I'm sure others make some base adapters as well.
Aadmount has a 20MOA built in Unimount available.
I suspect that an inclined Unimount will come in cheaper than buying good rings and a good base adapter, plus you have 1 less clamped/bolted joint in the equation and that's a good thing for reducing the variables that dictate reliability. Even if it was 20% more expensive, I'd spend the money on a precision grade unimount with machined-in incline.
If you're not a fan of unimounts (and some people aren't) that's fine, you just need to get a good adapter and a good set of rings. My personal choice has created enough controversy on this forum so I'll leave it simple to avoid bickering up a thread. I like the American Rifle Co. rings and I've bought them from Short Action Customs and directly from ARC.