Building the only precision bolt action upper receivers compatible with most LR-308 and AR-15 platform rifles. The UPR-10 and UPR-15 receivers simply pin in place of your existing upper receiver with no modifications or changes made to your lower receiver. They are available in most popular calibers available in both platforms. They feed from most standard magazines and work with most mil spec and aftermarket triggers. Uintah Precision is where precision makes a difference. (less)