well i got my first black rifle about 6-8 months ago (dpms oracle 5.56 stainless carbine) i didnt like the stock look of it so i changed a few things: milspec buffer assembly, SSAR stock, daniel defense EZ-CAR handguards, magpul angled foregrip, spikes tactical barrel shroud and leupold deltapoint after i got done with that i decided i couldnt just have one so i decided to build a 20" rifle length AR. figured i would get an assembled upper for my first build so i went with a YHM lightweight rifle upper assembly (1in7 20" fluted barrel, quadrail freefloat handguard, assembled upper and bolt). i added a magpul rvg grip, YHM bipod adapter, burris p.e.p.r mount and a leupold mark AR 4-12x40 scope with mildot reticle for the lower i went with a stripped SAA and assembled it with a psa lpk, geissele ssa 2-stage trigger, hogue grip, a2 buffer assembly and an ace skeleton stock. i got that all the way finished besides getting a bipod and good flipups for it and decided well heck i cant have only one caliber in my black rifle family so i decided to build another in 300 AAC blackout. i decided to build both the upper and lower myself on this one and so far have only completed the upper -bolt carrier assembly. built with daniel defense upper w/ dpms parts, vltor gunfighter CH, 1in8 16" ultra-lite stoner barrel, MI SS-series customizable tube ext carbine with a YHM low pro clamp on gas block under it, dsa trident flashhider and leupold prismatic dot sight. the lower is gonna be exactly the same as my rifle length besides the trigger, i have a geiselle SD 3-gun trigger i will be throwing in there for now. well now that i am almost finished with this one i am thinking of building yet another in a different caliber. was thinking of 243wssm or 204 ruger and looking for other peoples thoughts on these or if i should go with a different caliber.