I bought a Seekin's lower which is billet and by far a lot more stout then your OEM lower. I then purchased a complete Frank Proctor Windham 5.56 with a Midwest 15" keymod rail, also put a Gissilie SSA E trigger, an Eagle Strike Force, along with Mag370 rear stock, but after spending almost 2K on this, definitely didn't want to shoot it. Hence, I got the sporter II and this is perfect for a beater gun which I will use to plink