ERA-TAC Bases are reliable partners for attaching scope rings, fitting on many popular bolt action rifles. Users can directly mount scope rings to these rail segments or the ‘bases’ to hold the scope. The bases are precision CNC machined from 7075 aircraft grade aluminum or blued steel, and rendered complete with rust-proof tempered functional components, mil-spec hardcoat anodized surfaces and matte black finish. Available in different lengths and styles, these robust accessories meet mil-std-1913 and nato-stanag-4694 specifications and endure challenging conditions. The list of ERA-TAC bases for sale is inclusive of Picatinny rails or Picatinny mounting rails.