Not the best rail i've ever bought - Presma AR-15 Super Light Slim Free Float M-LOK Handguards w/ Partial Top Rail

19.5" Rail 2HC-FO-SLS15M-MMARB195

This is a decent rail but has some QC issues, atleast mine does.

Mine has several places where there are black magic marker spots, like someone went back over the finish and touched it up with a marker.

Also, this rail does not have enough clearance around the front pin on the lower. I had to beat my front pin in with a hammer because when the rail is fully clamped onto the barrel nut it is too tight up against the front pin and doesn't allow enough room to get the pin through the lower.

Now when I pull the rear takedown pin and rotate the upper away from the lower, the rail rubs HARD and the front of the lower pin hole and has rubbed the finish right off my aero lower and is biting into the aluminum of the lower and has caused the aluminum on the rail to bend at the pinch point as well. None of this affect the gun operation in any way, it just looks bad to have bright aluminum showing where the rail is rubbing the lower.

I wish I could upload pictures.

I do not recommend this rail if you are using an aero lower.