FN Self Loading Rifle 49 User Manual

HOW THE P. N. SELF-LOADING 
RIFG WORKS 
The gun being ready for firing the action on the trigger 
releases the hammer. 
Under the tension of its springs, the hammer 
strikes the firing pin, which in turn strikes the primer of the cartridge 
and ignites the powder charge. 
1st. phase. - Tho bolt opoam uador the actton oi the gas. 
A small amount of gas escapes through a port bored in the 
bai rel and passes in the gas cylinder where it kicks the piston back. 
The piston drives the bolt carrier back. The...

Fiq. I. 
a) Short gas cyhcler. - 
The 9as cylinder (IB) is a very 
short tubular element, easily cleaned, after the gas cylinder plug 
and the piston have been removed. As experience has shown that 
the gas acted on the piston in the way of a hammer blow, without 
any expanding, the ions cylinders which were generally, used in 
gas operated rifles, have consequently become useless. 
b) Gas escape. - After they have acted hi the way of a blow 
on the piston, the gas escape outside throu9h a slot (Al...

d) Iodm of the pbton. - The piston (12) and the bolt 
carrier (27) are located in a-straight line, without any COtUl8CtiOn. 
The return of the piston is performed instantly under the action 
of its own spring (13) without the interference of the return springs. 
It is owing to this original feature that it is possible to load the 
gun the same way as a repeatinb rifle. 
Turning 18(r the qas cylinder plug (8A1, cuts the inlet of the 
gas. The piston does not transmit any thrust on the bolt carrier. 
The...

Fig. 2. 
First Phase (position 1 to position ‘2) : Break of contact of the 
surface at B. The bolt is still locked (A) while the pressure in 
barrel is dropping. 
F&J. 3. 
Suomd b (position 2 to position 3) : Unlocking of the 
mechanism. The contact between surfaces C forces the bolt up. 
a!D 27  

Position 3 
Flq. 4. 
‘IMrd Phase (position 3 to position 4): Direct opentnq. The 
bolt and the bolt carrier are travellinq together rearwards owinq 
to the contact of surfaces F. 
When the parts are stopped at the rear, they are in position 4, 
the double return spring is compressed. 
Flq. 5. 
The cl- of the me&w may be schemed as below 
in 3 phases : 
Fowth phase (position 4’to position 5)‘: Clorinq of the mecha- 
nism. The bolt carrier pushes the bolt forwards owing to the 
contact of surfaces G till...

Position 5 
Fh. 6. 
FWh Phase (position 5 to position 6) : L.ockinq of the mecha- 
nism. At this moment the slope H forces the rear part of the 
bolt downwards, in the lockinq position. 
Position 6 
Flq. 7. 
Sixth m (position 6 to position 1). Confirmation of the 
lockhq. The bolt carrier continues its movement forward and the 
bolt is maintained in the locking position by the surfaces B. 
The repeatinq cycle is identical with the automatic cycle. 
k;trnaz receive the thrust d the piston, the bolt...

3. FEEDING - EXTRACTION - EJECTION 
The additional parts actin@ in this phase are : the 
(22) and the elector (51). extractor 
a) B&action of the case. - The extractor which is 
. fitted on 
the right side of the bolt performs this operation by direct extraction 
for the wlthdrdwal of the case (see above : 3d phase - posittin 3 to 
position 4). 
b) Ejociioa - The ejector is of the fixed type and is fitted 
in the trigger quard at the rear of the magazine. It protudes in a 
groove cut at the left and in...

very eaa to ensure, with a thorough knowledge of the where- 
abouts a perfect functioning of the rifle. 
With electors which are fitted elastically on the receiver this 
cannot be reached. 
c) lntroductlon of a cart&go. - The bolt has two ribs on its 
lower side, these ribs, when the bolt is closing (see above 
4th phase, - position 4 to position 5) push alternatively the left 
or the right side cartridge directly into the chamber. 
As soon as the cartridge leaves the lips of the magazine, it 
is caught...

J 
Fw 9 
Fiq. 10. 
Action of rifle ftrt.119 only stn910 shot fire. 
a) Sopcuotion of the shots iu stn910 shot ftro. - The device 
which allows to fire exclusively shot by shot, has been taken over 
from an outstandmg weapon (The Browning automatic shotgun). 
Since more than 50 years It ensures a perfect functioning to this 
popular gun. 
The hammer (31A) is forced backwards by the recoil of the 
bolt and bolt carrier and it is in any case caught by the double 
hook, which is made up by the front end of...