I bought two sets to see if they were any good.

Type 2 Class III Mil-Spec hard coat anodizedĠ of 0 people found the following review helpful:.

Machined from 6061/T651 Aircraft Grade Aluminum.

Five built-in anti-rotate sockets for QD sling swivels.

Four MIL-STD Picatinny rails at 12, 3, 6, and 9 o'clock.

No modifications to the firearm are required.

The precision machined rails enable consistent repeat of zero for any accuracy dependent devices such as optics or lasers. The AU design ensures a secure fit with no movement on the weapon while providing a solid mounting platform for accessories. Rails are located at the 12, 3, 6 and 9 o'clock positions, there are also 5 quick detach anti-rotate swivel ports located throughout for ideal sling attachment. They mount exactly like the factory hand guards but dissipate heat much more efficiently. The AU 7' Drop-In Carbine Length Quad Rail is a high quality 2-piece picatinny forend replacement for all mil-spec AR15/M4 carbine length plastic hand guards. You get what you pay for.AU 7' Drop-In AR15/M4 Carbine Length Quad Rail Description: It's $40 wasted in the trash for me, lesson learned. So you either run the risk with this handguard of having a gap, or ruining it trying to make it fit. I've heard of others machining or dremeling their handguards to get it to fit and I just didn't do it right. So in conclusion, I took the barrel nut, shaved off the end to better buttress the handguard rail to the upper receiver and now it won't tighten properly. The gap is the only thing about this handguard I really dislike.

This is a nitpick, however and that extra flashing of metal around the edges is a very small and inconsequential issue. I also do not like the unfinished flashing that seems to be on the edges. This company doesn't make either Milspec or their machining is not precise enough to be paired with a Milspec upper receiver. I've tried 4 I had laying around and none fit. There's no way I can fix this gap unless U find some other barrel nut that will accommodate this upper. Mine is fairly large and the upper I'm using is a Milspec Aero Precision upper. The gap issues I had read in other's posts are small compared to my gap on the rail for this handguard. I like everything about it, BUT, there's a noticeable gap. It's also rigid and durable, yet lightweight. This Handguard has all the features I wanted.

Ar15 carbine with 10 inch quad rail