Patrick, this has your standard two piece carbine length drop in handguard. If you are trying to replace it using the existing gas block/front sight post you need a ( carbine length drop in handguard ). If you want to replace the handguard for a free float this uses a .750 size gas block. So any .750 low profile gas block will work. I highly recommend adding a free float handguard if for no other reason it helps with accuracy. Hope this helps

Patrick, ---(( Full Specifications and Features )): - Del-Ton Echo 316 AR-15 Semi Auto Rifle RFTM160 - 5.56 NATO (accepts .223 Remington) - 16" Chrome Moly Vanadium M4 profile barrel - 1:9" Twist - M4 Feed Ramps - A2 Flash Hider - Fixed A2 Front sight base - Properly staked Mil spec BCG - Carbine hand Guards - Aluminum Delta Ring - Single Heat Shield - Direct impingement gas system - Forged 7075-T6 Flattop Upper Receiver - Forged 7075-T6 Lower Receiver - Ejection port cover - Forward assist - Right hand ejection - Aluminum Trigger guard - Aluminum Magazine Catch Button - M4 multi-position reinforced Fiber butt stock - Mil Spec Buffer Tube - Overall Weight 6.4 lbs Empty - Overall Length: 32.625 collapsed / 36.375" Extended. (You can replace the A@ Sights with a Low Profile Gas Block).

CAR handguards with single heat shields and carbine length gas system. This is pretty much your run-of-the-mill Milspec M4 style AR. I hope this helps!