Well, the barrel is Autococker threaded, so if you want a new barrel you have a ton of options. The feednecks are Ion threaded, so you have many options for feednecks as well. Dovetail ASA's should fit on it, but you might need to get some grub screws or a rail mount. The regulator ASA should fit any standard threaded regulator as well, but Azodin ones are fine. Azodin also makes a single trigger frame, so if you would prefer to have that, it should work.