Sig Sauer SIERRA4-BDX 6-24x50mm，30mm主鏡管，第二焦平面，BDX 2.0 彈道數據交換狙擊鏡

The illuminated holdover dot syncs with my rangefinder faster than I expected, and the glass stays crystal clear even at 6x in low dusk light. The 30mm tube felt solid mounting it, and after a full afternoon dialing adjustments, it held zero without any drift.

The windage and elevation adjustments click positively and track perfectly for me out to 600 yards. I paired this with a matching rangefinder and the auto-lock feature was spot-on right out of the box.

The illuminated holdover dot locked onto my target distance perfectly once paired with the rangefinder, and the 6-24x magnification is crisp even at the top end. Zeroing was straightforward, and the turrets have a solid, tactile click. This is the first time I’ve actually felt confident stretching o