The LBC's bolt and barrel are both incompatible with the SAAMI-spec Grendel's bolt and barrel, and retailers are often passing the 264 LBC as a "Type 1 Grendel" and calling the original, trademarked Grendel a "type 2 Grendel," which is the SAAMI spec but with more powder capacity, longer cartridge overall length, bolt compatible with the SAAMI-spec, and usually no compound-angled throat but a 0.3 inches throat.