Leupold mark 4 ims 30 mm 20 moa mount, matte, 171987 - Leupold Mark 4 IMS 30mm 20-MOA Mount

I like Leupold equipment, it's always dependable, but if you have a Sig Sauer SIERRA3BDX 4.5X14X50mm scope it will not fit on this mount due to the flat antenna on the bottom side of the scope. The antenna prevented the scope from sitting into the scope mount properly. I ended up calling Sig and the recommended one of their scope mounts or a Warne scope mount. I went with the Warne mount from Optics planet. They were good to work with on the return, no hassle is always nice on returns. It would be nice if Optics planet had a place on their website where you could check to see if the mount you were looking to buy would be compatable with the scope you have.