They shoot, realllly, good with fireforming loads so in all honesty there's not any wasted components.
Defensive Edge built my 223AI a number of years ago. It started life as a Rem 700 LTR 223 that shot great right out of the box but I thought I need a 223AI so I dropped it off with Shawn Carlock and he trued the action, ordered a fluted Hart 9tw barrel and chambered it in 223AI. Shawn gave me a heads up when it was nearly done but I didn't have dies for it yet so I dropped a box of factory Hornady Superformance 53gr Vmax off so he'd have something to shoot in it. Mine being a 9tw to shoot up to around the 70's, if I wanted to, has a bit of freebore so those factory 53 Vmax were jumping a longggg ways before touching and Shawn is a damn fine shooter but the first three shot group down the barrel shot a .114 group. I don't often save targets but even though I didn't shoot it, that's one I've kept.
I have a few others that are AI'd or are "improved" versions and they all shoot pretty darn good with fireforming loads but my 223AI just happens to shoot exceptionally well with fireforming loads, even that particular Hornady ammo.