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Hi Keith and welcome. Sig has been slow on any 10rd magazines. Blockers available here : https://www.magazineblocks.com/magento/sig-sauer-p320-10mm-full-size-10-15-magblock-10mm.html --------- This model is RMR red dot compatible and I highly recommend the Holosun HS507 c - https://www.budsgunshop.com/product_info.php/products_id/128940/holosun+hs+507c-x2+1x+multi-reticle+black+hardcoat+anodized ---------- Cheers and stay safe!

As a fellow NY'r, I'd go with Ed's advice on this one.

Check with your local FFl and see it they have any options for you to get one and have it modified