In this instance, yes I believe I used "build up" wrong. When I posted I didn't realize you could literally build an AR15 with pieces. Lol. He is definitely an attachments kind of guy. And to be perfectly honest I don't think he would go heavy into parts replacement even if I got him something he wouldn't have gotten himself.

I believe I'm going to go with the M&P15T with M-Lok. It has the esthetics he likes, and if I get the rail attachments he can start off with the items he already owns, and pick out new ones whenever he wants.

I'm actually really in love with the price point in this too. I set aside $2,000 so even if he does decided to swap the actual parts, it won't kill the budget.

Thank you everyone. Y'all have been incredibly helpful. I'm sure this is going to be his best Valentines ever.

__________________
Wife. Mother.