The gun barrel, breech mechanism, and the attached parts of other units are to be operated and maintained in accordance with the regulations of the Ordnance Manual, the directions of instruction plates on the assemblies, and the directions of this. http://Instructionaltech.net/__media__/js/netsoltrademark.php?d=Products-Dd.com%2Fcategory%2F%25e0%25b9%2580%25e0%25b8%2584%25e0%25b8%25a3%25e0%25b8%25b7%25e0%25b9%2588%25e0%25b8%25ad%25e0%25b8%2587%25e0%25b8%259f%25e0%25b8%25ad%25e0%25b8%2581%25e0%25b8%25ad%25e0%25b8%25b2%25e0%25b8%2581%25e0%25b8%25b2%25e0%25b8%25a8%2F