FORTIS Fortis F1 Optic Mount Lower 1/3 Co-Wit for Precision Rifle Scopes Fortis Manufacturing, Inc. F1, Black, Fits Aimpoint Micro T-2, Holosun HE403, Primary Arms Advanced Micro Dot, Sig Sauer Romeo4T F1-OPT-LOWER1/3 The Fortis F1 Optic Mount Lower 1/3 Co-Wit is... $85.99 $89.95 Quick view out of stock