So these just started shipping. Priced at $399 complete they seem to be a good option for the RA series.



Available for more than a few inlets, Im sort of digging this.

Emailed Onyx asking is it compatible with the Ruger American Ranch Rifle in 300 Blackout that originally came with Ruger's rotary mags.  Asked what mags work in Blackout.  Asked if Ruger .223 AI pattern mags work in Blackout.  Will post results.

Got a very prompt reply:

"Unfortunately, our chassis system runs into a similar issue as the Magpul Hunter stock. Our chassis will only work with the Ruger Gunsite Scout magazine which is contoured specifically for 223/5.56 and will not feed 300 Blackout without modification of the insert. We have included the note regarding this from our LSS page. We wish we were able to offer a better answer at this time. Please let us know if there is anything else we can do for you.

Ruger American in 223/5.56mm requires the use of this magazine http://shopruger.com/556-NATO-10-Round-Magazine/productinfo/90458/Does not work with 300 Blackout
It will fit Predator and Ranch versions. Please read notes on magazines for 223/556 rifles."