nightcrawler
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Regarding the metallurgical operations I being a Chemical Engineering can say for sure that Pakistan isn't being able to domestically produce 155mm howitzer or any equvalent!! The technology that is used for such products requires careful bore simulating drills metered amount of CONFIDENTIAL additives to the metal being forged & a smooth surface rendering at microscopic level. The following document provide some technical insight of a very new & cost effective method of manufacturing these large guns!!
FLOWFORMING MORTAR CANNON BARRELS.zip
FLOWFORMING MORTAR CANNON BARRELS.zip