Can't quite understand this one, but here's the situation...
First time firing my SBR, and also first time firing suppressed. Rifle is a Sig PM400 with 11.5" barrel, carbine gas, and fixed A2 FSP/gas block... stock everything except BCM receiver extension and spring with an upgraded H2 buffer...
Why would you want to engrave anything other than the receiver or registered part? Just curious... engrave the barrel and you can't ever change out an upper (in an AR situation).