SAFN 49 Gas on/off Point of Impact change?

[y2k]

On a SAFN 49, will firing it with gas shut off result in a different Point Of Impact than with gas turned on? What about some of you guys who fired the FNC1 in military did it make a difference?

 

[Zdragunov]

Not talking by experience, but if you eliminate the action movement, the rifle should group differently.

 

[scott585]

it will because more energy is propelling the bullet and less is used to cycle the action, this also affects harmonics. that said, the difference may be so small you cant measure it

 

[smellie]

There are a thousand things which can cause a shift in the POI of a rifle.

They include rest position, amount of bearing area of the rest, downward pressure onto the bearing area, ammunition variations, ambient air pressure, barrel-mounted vs stock-mounted bipods, bipod position/type, bayonet weight/position/presence/non-presence, presence/weight/position of other mounted accessories including brakes and launchers.

On a gas-operated semi-auto, it also includes gas on/off and the amount of gas used/vented, always in combination with ammo variations.

Best accuracy with most gas-op SA rifles will be with the gas ON and using just enough for the empties to clear the action comfortably.

The KEY is BARREL VIBRATIONS. Do anything to interfere with existing barrel vibrations and the thing will shoot differently.

Hope this helps.
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