Bushnell Professional Boresighter w/3 Expandable Arbors & Case

The Bushnell Professional Boresighter is a collimating scope-mounting tool that lets you align a riflescope or iron sights to a firearm's bore without firing a round. The collimator body is machined from aluminum and finished in a hardcoat anodized matte black coating for durability on the bench or in the field.

The kit comes with three expandable arbors covering .22 to .270 caliber, 7mm to .35 caliber, and .35 to .45 caliber, plus a fixed .17 caliber arbor for rimfires, air rifles, and similar small bores. Each expandable arbor telescopes down for compact storage and snaps out to fit a wide range of centerfire and rimfire chamberings, making the set genuinely universal across most common rifles, pistols, and shotguns in that caliber spread.

Using the Professional Boresighter gets you on paper at the range quickly, achieving a boresight precision equivalent to roughly 4 inches at 100 yards without live fire. The entire kit, collimator and all four arbors, stores neatly in the included deluxe carrying case so everything stays organized and protected between sight-in sessions.