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Brian, this model has a rounded only buffer tube. It does not have the slots to use most braces. You will need the slotted buffer tube to use adjustable Braces : -- https://www.budsgunshop.com/product_info.php/products_id/2780/spikes+sla500r+mil-spec+buffer+tube+6-position+7075+t6+aluminum+black

Brian, the only brace I Know of that fits this buffer tube is the ( kak shockwave brace ). Any other pistol brace will require a milspec carbine length buffer tube. Here's a link to a inexpensive buffer tube that will work fine. With this buffer tube you can add just about any AR-15 pistol brace you want and it's simple to replace, just watch a video online on how to change buffer tubes. I would recommend the SB tactical sba3 brace, they're little pricey but worth it. Hope this helps, link to buffer tube here........... https://www.budsgunshop.com/product_info.php/products_id/52008/aim+sports+xdb15pstoc+buffer+tube+mil-spec+ar-15+m4+black+anodized