Havent contributed in a while. Trying to get a little assembly time this week and started my 450. I have had a big bore itch that needed to get scratched. I was going the 458 socom route but ammo is way too expensive for my cheap ass.
I had a bunch of spare parts laying around and needed to pickup a barrel and bolt to get this going. Franklin Aromry is the place for 450 parts if you are so inclined.
This is really no different than any other AR assembly. One exception is to open the ejection port to help get the monster case flying. For me it was an easy deal. DPMS slick side uppers are a snap with a Dremel carbide cutter and stone.
Got everything painted with desert tan duracoat and will snap a few pics when it dries