| http://www.w3.org/ns/prov#value | - Apparatus for measuring dimensions to calculate the head space of a gun, said gun including a receiver and a barrel, said barrel having a first end and a second end, means for attaching said first end to said receiver, said attaching means including a threaded portion disposed about the longitudinal axis of said barrel and having a planar surface disposed about said threaded portion, said planar s
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