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Hi Garland and welcome. Yes Sir the Swampfox Liberty 1×22 features the Trijicon RMR mounting standard. The 5.7 is cut for a specific optic, a Trijicon RMR, but also fits any Holosun red dot optic like the 507c and k.Cheers and stay safe!

Hi Garland, the S&W 5.7 is cut for an RMSc mount red dot. The swamp Fox Liberty has a RMR footprint, so it will not work. Here is one that will fit - budsgunshop.com/product_info.php/products_id/723017040/swampfox+sentinel+1x16+ultra-compact+micro+red+dot+auto+brig , Stay safe & have a great day!