re: Official AR-15 thread

I'm trying to figure out what I want to use my lowers to build.

I know I'm going with a .300 and probably another 5.56 (maybe a 20") with 2 of my lowers but I'm trying to decide what to use the others to build

7.62x39mm
.458 socom
6.8SPC
rifles not pistols
9mm
.40sw
.45acp
10mm


I'm leaning towards the 7.62x39 and maybe a 9mm. then saving the others for future builds when new stuff comes out or another build of one I already have but with some different features. The possibilites are endless the money however is limited.