This AR-STONER upper will attach to virtually any standard AR-15 lower receiver, and with the addition of a magazine adapter block you can be range ready in just a few minutes. The AR-STONER AR-15 Upper Receiver Assembly comes complete with charging handle and M-LOK handguard. This upper does not include a front or rear sight, making it a great platform for a red dot or scope (sold separately). FeaturesM-Lok handguardMil-spec bcg & charging handle includedGlock & Colt mag compatible only