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Russell, this has a non slotted buffer tube for the non adjustable SBM4 Brace. You will need to change the buffer tube to add an adjustable Brace. ---- https://www.sb-tactical.com/product/sba4/

Russell, you would have to change buffer tubes. Very simple to do and inexpensive. Any carbine length milspec buffer tube will do the trick. Then just choose a different brace, I really like the sba3 brace. Here's a link to a buffer tube that will work if interested. Hope this helps, link here..........https://www.budsgunshop.com/product_info.php/products_id/52008/aim+sports+xdb15pstoc+buffer+tube+mil-spec+ar-15+m4+black+anodized