With no barrel restrictions, the Chimera is arguably the best choice for a short barreled rifle (prepare to build your two-tax-stamp setup). Full-auto rated and compatible with 22 Hornet to 300 Winchester Magnum, the Chimera is usable on a variety of hosts. The Chimera is shipped with the reliable quick-attach ASR Mount and a 5/8 X 24 Muzzle Brake for easy installation.