Caliber .50, M2 Browning Machine Gun: Proper Headspacing. By General Motors, AC Spark Plug Div. Books / Paperback Books Publisher: GM/AC Spark Plug/Frigidaire, May 1943., January 1943 Price Starting at $23.11 Free Shipping Send to a friend Add to Wishlist Below is a list of products arranged by condition. Select the quantity of the product you desire and click the "Add" button. Collectible - Good First Edition First edition copy. Collectible - Good. Slightly dampstained. (guns, weapons, firearms, manuals) $23.11 1 in Stock at Warehouse Quantity Add Free Shipping to continental U.S. OR $1.00 per item discount if shipped to store. Reviews Goodreads reviews for Caliber .50, M2 Browning Machine Gun: Proper Headspacing. There are not any review yet for this book