Owner’s Manual 2016

2.3. Functioning

General

The FN PS90

Carbine is a unique, compact, lightweight personal

defence firearm firing 5.7 x 28 mm ammunition and featuring

extremely low recoil.

The reliable operation of the FN PS90

Carbine is ensured by a

straight blow-back mechanism, designed to operate in the most

rigorous field conditions.

With a loaded magazine and after having been cocked, the

carbine will fire single shots until the magazine and the chamber

are empty.

Features :

Compact dimensions

Completely ambidextrous

Ergonomically shaped

Downward ejection of the fired cases

The rounds loaded from the magazine are automatically

chambered : the force for that operation is supplied by the return

movement of the breech block.

Composition

The FN PS90

Carbine consists of the following assemblies and

components (also refer to the exploded view in § 2.2) :

• The barrel support and upper rail group

The barrel support and upper rail group fits into position on top of the

front part of the frame and consists of the barrel, its support and the

upper accessory rail.

• The frame and trigger group

The frame and trigger group consists of a polymer frame onto which

the fire selector and the trigger system have been installed.

The ejection port, in the bottom of the frame, allows for downward

ejection of the fired cases.

• The moving parts group

The moving parts group, built around the breech block, converts the

recoil energy generated when firing a round into the kinetic energy

necessary for the operation of the carbine.

• The hammer group

The hammer group controls the firing of the firearm.

• The magazine

The magazine is fitted on top of the frame, above the barrel and the

moving parts.

For more information, refer to ‘Magazine’ further in this paragraph.

• The butt plate