Definitely not calling you an idiot, but the biggest complaint is what these rifles weigh…and you’re talking about adding 5-6lbs. That makes the gun around 20lbs and if that’s what you’re after, it’s your gun and you can do what you want. It’s just against the flow of normal thinking. They “why” really wants to be discussed on this though, because you’re looking for ideas on a solution you came to, but there may be better solutions to the “why”. Some details about how you’re shooting, what you’re shooting and what you’re looking for from the gun will help get you there. If adding a bunch of weight is the final answer, you probably want to start with the Magpul and add weight to that.