I usually wet mold my holsters to the gun. Wipe it or spray the gun down good with oil ,wrap in plastic [grocery bag works ok] and stick it into the dampened holster.Leave till dry ,next day. This works for me gun is snug, but not tight.Looks like you could drill out the bottom rivet on the belt loop and secure your retention strap there.

Edited by junebug (04/27/18 09:32 PM)
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junebug