I have taken a foot off of panty hose and put it over the gun the shoved the gun down hard in the holster. for the retention strap I folded a thin piece of leather and put it between the gun and the strap. Let it set a few days, pulled it out and tried it and kept it up till I got the fit I wanted. Some are tougher than others. Hope this helps.
Peace,
gordon

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better have that checked