Board Thread:Questions and answers/@comment-26824337-20160104160859/@comment-3362895-20160106071704

Try eBay here: http://www.ebay.ca/ulk/itm/131693368744

One other possibility is to get a Nerf-to-Picatinny rail adaptor and then get a real Picatinny-based angled foregrip. Pretty decent prices, looks like.