Now you can find the perfect solid steel mount base to add to your collection with the Weaver Grand Slam Steel Top Mount Base - Matte Black. The design will mount to a 3/8-inch grooved receiver. You can put this mount to the test with any of your scope mounting needs. Whether you are in the market for a solid steel Grand Slam construction or you want something lightweight such as the aircraft-grade aluminum you can find it with Weaver.