Hi Eric and welcome back. Spikes 6 position Buffer Tube; -- budsgunshop.com/product_info.php/products_id/2780/spikes+sla500r+mil-spec+buffer+tube+6-position+7075+t6+aluminum+black ---------------------------------------- and the updated SBA5 Adjustable Brace which is sturdier than the SBA3 Brace; - budsgunshop.com/product_info.php/products_id/165735/sb+tactical+sba5x01sb+sba5+brace+black+10.25 ----- would complement this Radical Pistol quite nicely. Cheers, stay safe and enjoy!

Good evening to you!! Please see below link for more information. Hope this helps. Have a good rest of your day.
🇺🇸🇺🇸 'Merica' 🇺🇸🇺🇸
budsgunshop.com/product_info.php/products_id/712022762/century+arms+ar15ak47+pistol+blade+kit+tube+and+castle+nut --
budsgunshop.com/product_info.php/products_id/165735/sb+tactical+sba5x01sb+sba5+brace+black+10.25 --

Get this one: budsgunshop.com/product_info.php/products_id/143778/sb+tactical+sba3x-01-sb+sba3+brace+synthetic+black+5-position+adjustable+for+ar-platform+tube+not+included

There are many adjustable 6 position buffer tubes available below, take your pick.
budsgunshop.com/search.php/q/buffer+tube
>

As far as Braces, again, up to your liking below.