The TRYBE Defense R.O.C.S. Rapid Offense Chassis System should work with a Ruger American Ranch in 7.62x39.
the ranch in 7.62x39 uses AR type mags?
I don't believe the TRYBE is setup for that?
Are you positive it will fit the Ruger American in 7.62x39? Because Magpul's Ruger American replacement stocks will not fit the 7.62x39 version as the "bottom metal" and mag latch are designed solely for the Ruger Mini 30 7.62x39 magazines, Not STANAG, not AK, and not AICS pattern mags.....