Barska Iron Laser Boresighter Kit w/15pc Arbor Set. The Iron Boresighter Kit by Barska uses a 15 -piece arbor set that ranges from .177 to .50 caliber and ensures precise bullet placement from the get go. These Bore Sights fit snugly in the rifle barrel to eliminate any "play" that can result in an inaccurate boresighting adjustment and poor shooting accuracy. Specifications for Barska Iron Laser Boresighter Kit: Manufacturer: Barska Condition: New Features of Barska Iron Laser Boresighter Kit: Arbor Studs Caliber 0.177 0.22 6mm .25 6.5mm .27 7mm .30 .32 .338 .35 .375 .44 .45 Package Contents: Barska Iron Laser Boresighter Kit AW11076 We offer a complete line of Bore Sights by Barska. For our complete selection of products by Barska that are on sale please visit our Barska page. For more Barska Bore Sights please visit our Barska Boresights store section. Barska Iron Laser Boresighter Kit w/15pc Arbor Set AW11076