CZ USA 457 Royal Walnut Bolt Action Rifle - 22 Long Rifle - 20.5in - With a premium Walnut stock and decorative forend tip, the Royal definitely plays the part. Intended for use with a scope, it has a high, flat American-style comb and no sights, while its forend is especially long, giving it an attractive look that harkens back to early rimfire rifles. The Royal has a muzzle threaded 1/2x20 (a European standard).