HOW TO AJUST GAS SYSTEM ON SAFN-49

[MOREGUNS]

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JOE

Alpo02@aol.com

[knight0334]

It takes an adjustment tool.


http://www.recguns.com/Sources/IIID2...s%20Adjustment

[gold cup abuser]

This is from The High Road web site:

Gas Adjustment
The gas cylinder is located under the front handguard. A threaded sleeve is provided on the outside of the gas cylinder in order to adjust the opening size of the gas bleed vent. This adjustment is used to regulate the amount of powder combustion gas that is applied to the end of the piston rod. The sleeve is screwed farther onto the gas cylinder toward the front sight in order to block the gas vent reducing its size, thereby increasing the pressure applied to the piston rod. Alternately, it can be rotated the opposite direction, away from the front sight, to open the gas vent, thus reducing the amount of gas pressure applied to the piston rod._

Proper adjustment of the gas system is needed to prevent violent ejection that results in excessive wear and tear on the rifle. Gas pressure can increase or decrease with different types of ammunition, ammunition production lots and atmospheric conditions. The gas system has a broad operating range and does not require minor adjustments when set properly for the type of ammunition and powder being fired. Once the gas regulator is set, mis-adjustment through tampering or accident is prevented by having the regulator sleeve located under the front handguard._

To adjust the gas system, begin by removing the front handguard. This is accomplished by first removing the stock end cap screw and then the stock end cap located under the front sight assembly. Once the stock end cap screw is removed, the stock end cap is removed by sliding it forward to disengage it from the tabs on the front handguard and then downward off the barrel. The front handguard is then removed by sliding it slightly forward out from under the lower stock band and lifting it off the rifle from the forward end. Removal or loosening of the lower stock band should not be required._

Begin the gas adjustment procedure by rotating (opening) the gas regulator sleeve on the gas cylinder until the gas vent is completely unblocked. From a standing position, fire a single round of ammunition of the desired type. Note how far the spent cartridge is ejected from the rifle. If the spent cartridge fails to clear the receiver or is not ejected sufficiently to achieve approximately 8 to 15 feet to the forward and right of the firer, screw in the gas regulator sleeve several turns until the gas vent is slightly blocked and repeat the procedure. The proper setting is attained when a spent cartridge is usually ejected some 8 to 15 feet to the forward right of the firer. A setting that causes the spent cartridges to be ejected farther can cause excessive wear and stress on the rifle. Too little gas pressure can result in unreliable spent cartridge case extraction and lack of ejection. In my experience, it is not unusual to have a spent cartridge ejected rather close to the rifle now and then, but on average they should fall approximately 8 to 15 feet from the rifle._

Excessive gas pressure can cause premature extraction of the cartridge case, even before chamber pressures have decreased sufficiently to allow the cartridge case walls to contract from the chamber. A sure sign of extreme gas system pressure is having rims torn off spent cartridge cases by the extractor. Excessive gas pressure will also be evident when spent cartridge cases are being ejected into low earth orbit, are being heavily dented by the receiver cover, or the spent cartridge case fails to be extracted from the chamber altogether. "Hotly" handloaded cartridges as well as extended range factory loads can cause this same problem and even a properly adjusted gas regulator sleeve and gas vent system may be unable to compensate for these excessive pressures. Like most semi-automatic rifles, the FN-49 functions best with cartridges loaded to the middle of the normal pressure range. The FN-49 is built sturdy enough to handle "hot" loads quite well, but the gas system may not be able to function properly in those circumstances, and semi-automatic firing should not be attempted. In these cases, such as when using extended range factory loads, set the gas plug to single shot operation (see the section below under grenade launching)._


here is the full thread on the subject:

http://www.thehighroad.org/archive/i...hp/t-9576.html

btw nice very very nice choice of rifle there