The sum of any set of consecutive odd numbers starting from 1 is a square, and the quantity that is squared is the count of odd numbers in the sum. The latter is easily seen to be a count of the form 1 + 2 + 3 + 4 + ...
shooting brake - another name for a station wagon. beach waggon, beach wagon, estate car, station waggon, station wagon, waggon, wagon - a car that has a long body and rear door with space behind rear seat.
Update - emailed DSA directly - Received a response from Russ. 1  Both are true, The Bolt itself is not shot peened, but the carrier is shot peened, when most people refer to a bolt they generally mean a true complete bolt carrier group. This may be where the confusion lies, there really isn't any benefit to doing the process to the bolt only the carrier gets improved when the process is done.