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Chris, The Advanced Armament Squaredrop is a proprietary free floating handguard system for the AR-15 family of rifles that allows infinitely adjustable mounting positions for any KeyMod or Squaredrop accessory. KeyMod Rail Sections are here : https://www.budsgunshop.com/catalog/search.php?q=keymod+rail+section&type= ---------- and I highly recommend this Harris Bipod and Adapter : https://www.budsgunshop.com/catalog/product_info.php/products_id/711008674/harris+bi-pod+adapter+mil-spec ------------------- https://www.budsgunshop.com/catalog/product_info.php/products_id/81113/harris+bipod+adjusts+from+9%22-13%22