It is attached to the gun by a picatinny rail.

A Picatinny rail is equipped on the top of the receiver.

Has a Picatinny rail in place of its integral optical sight.

Even more recently was the addition of a Picatinny rail to the dustcover as standard.

Has a Picatinny rail on the barrels to attach accessories.

The rifle also has a picatinny rail for mounting optics.

It had a short Picatinny rail on the top and a smooth pistol grip surface.

This production variant can be fitted with multiple Picatinny rails.

This is where a Picatinny Rail accessory system could be found, if present.

The D models also include a second bottom-mounted Picatinny rail.

The picatinny rail allows for a variety of add-ons.

The addition of a new Picatinny rail allows you to mount a light, laser or other accessory.

A set of picatinny rails on the hand guard can mount various optoelectronic devices.

It is equipped with a Picatinny rail and a finger groove trigger guard.

Five Picatinny rails were added to be able to increase the performance of the weapon for the soldier in comparison with its predecessor.

The upper receiver is flat-top with a Picatinny rail.

The rifle was also equipped with a military standard Picatinny rail mounted on the steel receiver.

It is also fitted with a Picatinny rail for mounting of opto-electronic devices.

A Picatinny rail is used as well.

The scope was replaced with a Picatinny rail that later had a reflex sight attached to it.

A length of the Picatinny rail is installed on the carrying handle to accept various optical sights.

It has a picatinny rail on the top body and has a different stock and grip design.

Picatinny rail: a bracket used on some firearms in order to provide a standardized mounting platform.

It incorporates an elevated upper Picatinny rail that also doubles as a carrying handle.

Modifications done on the refurbished weapons include an integral suppressor and a Picatinny rail.