As hunters know, there are varmint-hunting rigs, and then there are the true varmint-hunting setups. Sure, you can take a rifle and make it into a varminting platform, but if you know you're going after varmints, then it's time to step up to a caliber/platform combination that's designed to give you premium performance in the field. This Stag Arms Stag-15 Super Varminter Upper Receiver has been built from scratch to give you the best possible platform for your varmint hunts. Each Stag Arms Stag-15 Super Varminter is chambered for the hard-hitting 6.8 SPC II cartridge, complete with a SAAMI SPEC II chamber. The 20-inch barrel itself is rifled with a 1:11-inch twist rate that's optimized for use with dedicated varmint cartridges, and the 11-degree target crown ensures consistent accuracy from shot to shot. These upper receivers are completed with Stag's 16.5-inch M-LOK SL free-floated handguard, so you have a comfortable, versatile mounting platform for optics and accessories. All you need to do to complete this Stag Arms Stag-15 Super Varminter Upper Receiver is add a bolt-carrier group and charging handle of your choice, and you're ready to hunt.