These 17-4 H900 Direct thread mounts will install in Gemtech, Liberty or B-Tube suppressors with 1.180-24 or 1.1875-24 (1-3/16-24) threads.
The M13.5×1 LH mount has the 25° Sig taper
1.180-24 threaded accessories are compatible with 1-3/16 24 (1.1875-24) threaded suppressors, though fitment will be a bit loose.
1/2-28, 1/2-36, .578-28, 5/8-24, M13.5x1LH Sig Taper, M16x1RH, M16x1LH
Natural 17-4 H900, Burnt Bronze, Coyote Brown, Tan FDE, SOCOM Black, Grey-Black Colt Flat, OD Green, Flat Brown