We just got our (now) modified XCR-M stock adapters back in from anodizing. These started as our original XCR adapters but were then bored our in the center so they will work on the Type 1 Modified & Type 2 lower receivers. Follow the linky :
https://dlaskarms.com/products/xcr-m-ar-15-stock-adapter-w-qd-sling-point
https://dlaskarms.com/products/xcr-m-ar-15-stock-adapter-w-qd-sling-point