SIG SAUER SIERRA3 BDX RIFLE SCOPE 3.5-10X42MM BDX-R1 DIGITAL BALLISTIC RETICLE SIERRA3BDX 3.5-10x42mm riflescope with Ballistic Data Xchange. The scope provides the hunter an illuminated auto-holdover dot on targets when coupled with a BDX capable KILO rangefinder. LevelPlex digital anti-cant, and KinETHIC kinetic energy transfer indicator, the SIERRA3BDX is incredibly simple to use. Range a target, put the holdover dot on target, pull the trigger, impact. SIG SAUER’s BDX, just CONNECT THE DOT