The Range Systems Sight-Bloc™ is superior to sandbags and metal rests for sighting in a rifle. Its molded rubber construction provides a stable rifle rest that can be easily re-positioned to provide three different heights. The Sight-Bloc™ will endure extreme conditions and unlike sandbags will not absorb water or leak its contents. The versatile design of the Sight-Bloc™ accommodates for larger capacity magazines as well, all one needs to do is simply rotate the product to change the height from 4″, 7″ or 9″. The use of tracers or any other incendiary-type round is prohibited.