M015 QD Adjustable Rear Sight for M4 / M16, Black

You swap optics, you run a magnified sight sometimes, or your rail real estate is split between a red dot and a light. You need iron sights that get out of the way when you don't need them but are still there when the battery dies. That's what a QD sight is for.

The M015 from SteelBid is a quick-detach adjustable rear sight built for M4/M16 airsoft rifles. Full steel construction — it won't flex, bend, or crack under the kind of knocks polymer sights fail from. It mounts on any standard 20mm Picatinny or Weaver rail, so it goes on almost any AEG handguard or receiver top.

How it works. The sight flips up from the rail into position with a single press, and flips back down flat when you're running an optic or just don't want it in the way. The raised sight features an adjustable aperture with windage correction, so you can dial left and right without tools. A protective hood surrounds the rear aperture, shielding it from accidental bumps and breaking up the sight picture so you focus on the front sight — which is where aiming actually happens.

QD sights are there as backup. They're not going to make your red dot sharper, but they are the thing that saves you when your optic's battery dies mid-game or gets knocked out of zero. SteelBid is one of the most widely used aftermarket sight manufacturers in airsoft, and the M015 is their most common rear sight — meaning replacements are easy to find if you ever lose one.

Before you buy. This is the rear sight only. If you need a matching front sight, look for the M014 QD front sight, which pairs with this one and mounts on the same rail standard. Both flip independently, so you can run rear-only, front-only, or the full pair depending on your setup.