ZCI CNC Aluminum Quad Rail Free Float Handguard for M4 / M16 AEG Rifles
(Length: 4")

"Pretty happy with this rail. Inner diameter is 1.825". Mine isn't sharp like since of the other reviewers mentioned.

"I got this to replace my standard m4a1 barrel with the delta ring. It didn’t come with any instructions, but found the install to be pretty straightforward. Overall it’s sturdy, not overly heavy, and looks great. The inner diameter is large so fitting my ace tech at-1000 tracer inside for an integral look worked beautifully. They’re a really great rail for the price, but wear gloves installing unless you don’t mind having a bunch of tiny cuts on your fingers. Not a big deal to me but saw some others mention this as well. But for anyone wondering, it goes on straight, locks in place, and doesn’t wobble whatsoever. It includes everything needed for install as well which is nice.

"This Rail is Awesome the quality of there metal is amazing and the finish is awesome it is nice and lightweight which was super suprising. The mounting system is suprisingly sturdy even though there is one screw holding the rail onto the barrel but. I installed this onto my friends cyma ar. For the price this is the end all be all for airsoft rails in my opinion.

Pros
Pretty budget for airsoft rails
Lightweight
Sturdy
Lots of Rail Space
Cons
Machined so well that the edges are a little sharp but if you wear gloves which let’s be honest you should be wearing if you play airsoft you’ll be fine as they aren’t to sharp