BoreBuddy Apogee 21 Sharp Barrel (Lengths: 12, 16″)

Description Threads: 1/2-28, 0.400″ long (rimfire length).  We cut a proper thread relief at the base of the threads for compatibility with any 1/2-28 device. Assembly OAL notes:  Rimfire barrels sit at a different position in the upper than centerfire barrels due to the design of the bolt.  The chamber entrance is about 1.5″ farther back in the upper once assembled.  This will result in a shorter overall length of rifle/pistol than the same rifle/pistol built with a centerfire barrel of the same length.   12.1″ rimfire builds to an OAL similar to a 10.5″ centerfire (10.5″ of the barrel is in front of the upper threads) 16.1″ rimfire builds to an OAL similar to a 14.5″ centerfire (14.5″ of the barrel is in front of the upper threads)   12.1″ – 10″ rail maximum for barrel threads exposed 16.1″ – 14″ rail maximum for barrel threads exposed