ZCI CNC Aluminum KeyMod Ultra Slim Free Float Handguard for M4 / M16 AEG Rifles
(Size: 13.5")

"This thing is great, super super solid, very light, I thought the box that it was in was empty lol. And it DOES NOT have any sharp edges. Mounting it was a breeze, it took less than a minute to get it on and all tightened in place. Overall 11/10 I love it.

Also I had a delta ring type rail (the one with quad Picatinny rails) and I didn’t need a A-R wrench to take off the old rail if you were wandering.

"Nice feel for the price, doesn't come with shims works as it should.

"Fit fantastic on a G&G Combat Machine body, however it does have a tight diameter.

I use an Acetech Lighter R and it fits into the handguard comfortably, but anything much larger than that will likely be too snug a fit to work.

Other than that, a very lightweight handguard, especially compared to a four sided picatinny Daniel Defense rail!

So long as you don't have a girthy barrel accessory, there's really no reason to pay more than $20 for a quality handguard.