My 9 year old thinks he's ready to put some fur on the ground this year so we decided he needed a calling rifle. Of course, when I gave him a choice of AR or bolt action, he went with the AR. Anyway, this is what we came up with and he's pretty stoked.
I took one of my old 3 gun uppers and went after the stainless barrel and tube with Brownell's Alumahyde paint (good stuff) to dull it up a bit and added a Vortex PST 2.5-10x44 in a LaRue mount.
The lower is a UT Arms with a JP trigger, Ergo grip and ACS-L. I still might change out the comp so it's not so loud and possibly add an offset Burris Fast fire.
I started building a heavy varmit rifle and instead went light-er weight....The upper is a Sportical I bought here in the classifieds, 16" light 1/9 barrel, Lavang comp, mid-length free float tube, Ace Skeleton stock, DPMS trigger group, Mueller 4-14x and a Noveske "chainsaw" lower. Sportical upper on a Noveske lower...FrankenAR.
My 300Blk that I threw together recently for deer season. Suppressor is NY State pinned/welded fake. 30 rd Pmag is NY state 10rd shortened pinned and epoxied. Love where I live, can do without the BS laws.