Our in-house one-piece scope base will provide you the benefit of accurate shooting when you need it most. - Features - Precision-machined from 7075 aluminum - Black anodized finish for corrosion resistance and durability - Lightweight at just 2.5 oz - Uses 8-40 screws - Compatibility - Fits all Evoke receivers - Fits long-action Std. Rem 700 receivers that use 8-40 screws - DOES NOT FIT any Christensen Arms rifle except for the Evoke