Well, if you ask a question on any Internet forum, you're bound to get many different opinions. Some here I can agree with, but by no means all.
I don't post here very often so here's my background for reference:
24-year LEO, primarily maritime boarding operations, CQC, I've fired a couple hundred thousand rounds through various weapons systems, also an occasional hunter, competition shooter and recreational plinker.
Here are some things I think are important for you to know at the entry level in 2025:
1) Milspec M4 handguards are out. Thats why everyone including the military are swapping them out. Save yourself the trouble and buy or build something with a rigid forearm. There are lots of great options. The M-Lok pattern seems to be winning the fight over attachment options and for good reasons. It's cheap to manufacture, its lightweight and smooth to hold onto, and it is secure under recoil with plenty of surface area engagement. This makes it better than a quad rail or Keymod.
6) I would buy a pistol brace for this firearm. You can run short or long barrels as desired.
1)Not everyone wants to hang a lot of gunk off their AR's. I know plenty of people that prefer the simple handguards.
6) If your building one from a virgin lower or buy a pistol AR you can put a brace and short barrel on it. If you have a standard AR you can't put a brace and short barrel on it. Once a rifle always a rifle unless you stamp it as a SBR.
From the ATF:
"An assembled rifle: A lower receiver that was first assembled with a 16-inch or longer barrel and a stock is legally a rifle forever. Putting a shorter barrel on it, even with a pistol brace, will constitute making an SBR without the proper registration."
I love the skinny old school handguards.
