So I ordered a few lowers from PSA and am planning to slowly build my first ar a few parts at a time... I have an interest in 3 gun and am thinking of building it to suit that game. My question is what would I be limiting my self to if I only have one AR set up for 3G? I hope this makes sense. Im thinking 18" SS. Rifle length. Really nice trigger. Optics with off set irons...