only way I know
open a file that has a gkgun in it , then highlight that ref , then export that ref then u should have a file in your directory (same one main file is from) called gkgun.ref , next open file u want to have one in and import/add option . then move gun to desired location like u would any other ref or if u want u can use mine , these are gkgun.ref and gkturret.ref both ready for import.
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