I echo Tom Heller's (lugerdoc) remarks... without the proper tooling, there is a great chance you will damage the upper receiver... If yours is a parts gun, and of no collector value... then you only have your investment to lose... If I were you, and I were still a machinest, I would spend my time making the barrel / receiver wrench and vise... it would be a wise use of your time if you intend to change barrels more than once.
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regards, -John S
"...We hold these truths to be self-evident that ALL men are created EQUAL and are endowed by their Creator with certain UNALIENABLE rights, and among these are life, LIBERTY, and the pursuit of happiness..."
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