Single Shot AR-15 Lower - Stripped
https://www.bigkahunaguns.com/shop/acc-bk-ssl-single-shot-ar-15-lower-stripped-283
https://www.bigkahunaguns.com/web/image/product.template/283/image_1920?unique=eb2e2c1
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Single Shot AR-15 Lower fits the Raptor 50.