I am looking for the front end of a MkI receiver . Were all of them treaded for the gas cylinder ? I am looking to build a MkI semi-auto . I have the MkI receiver sections with out the first 9'' which the gas cylinder is attached . I do have the front end section from a MII, could it be used ? Will all of the MkI parts work with the MkII front end welded on ?
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