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Kevin, You will need a slotted buffer tube to add a Stabilizing Brace (the one on the Pistol is just a round tube. https://www.budsgunshop.com/product_info.php/products_id/5173/patriot+ordnance+factory+00342+buffer+tube+anti-tilt+ar-15+mil-spec+7075+t6+alu ---------------------- Standard AR mags will work but there are .300BLK specific magazines : https://www.budsgunshop.com/product_info.php/products_id/114333/magpul+pmag+m3+300black+30rd+black

Kevin, for Magazines you can't beat magpul. Any AR-15 magazine in 300blk will work though. Here's a link to one I'd recommend if interested..... https://www.budsgunshop.com/product_info.php/products_id/114333/magpul+pmag+m3+300black+30rd+black....... As for a brace yes you can add something like the kak shockwave brace to this buffer tube but I'd recommend just replacing it with an adjustable buffer so you have more options for something like the SB tactical sba3 brace Wich is fantastic. Any carbine length milspec buffer tube will work. Here's a link to one from aero precision I'd recommend....... https://www.budsgunshop.com/product_info.php/products_id/128083/aero+precision+aprh100136c+buffer+tube+carbine+mil-spec+ar-15%252c+ar-10+black+7075+t6+aluminum..... Here's another link to one, I'd recommend the aero one but here's your cheapest option........ https://www.budsgunshop.com/product_info.php/products_id/52008/aim+sports+xdb15pstoc+buffer+tube+mil-spec+ar-15+m4+black+anodized...