I really like both of these and would love some input from the group. I’ve considered getting the radian lower on a kac upper but it seems hard to find either of those on their own right now. Purpose of the rifle is general shooting/training/defense. Will be stored in a quick access safe in the bedroom. Will wear an Aimpoint T2 and ModLite PLHv2 long body with click tail cap.
The radian is appealing for the great lower, fit and finish, and accuracy. Primary concern is weight.
I like the SR15 for the reliability, the rail, gas system and bolt. Proprietary parts are a minor concern. It’s what makes the SR15 the SR15.