There are TWO types of adjustable gas system on rifles, the kind that takes a constant amount of gas and bleeds what it doesn't need, and the kind that you can adjust the amount of gas which is bled. Klacks and things like that just take, use and vent: no adjustment. M-14 has a self-adjusting piston. You don't.
Your SAFN has the type of gas system which TAKES a constant amount of gas and BLEEDS OFF what it doesn't require. That's fine and dandy but YOU have to adjust it. The correct adjustment for ANY semi-auto rifle is so that th rifle has enough gas to opeate reliably and that's all: no winging the brass two provinces away. I have an Indian FAL which has the gas adjusted to military specs: brass jst comes out of the rifle and and lies on the bench. It shoots almost an inch exactly, with those pathetic sights. Before I made the gas adjustment, it shot 3 inches and I had to drive across Saskatchewan to pick up my empties.
The WAY you set your rifle up is by first removing the forward top handguard, then bench-resting the rifle. The gas adjustment s just behind the gas block. It consists of a threaded sleeve with an angled end to it so that depening on how much it is turned, it will allow more or less gas to vent from the little hole in the gas tube. I your rifle is mngling brass and throwing it halfway to Timbuctoo, OPEN the bleed hole until it behaves properly. If the rifle does not cycle, CLOSE the gas vent progressiv ely until reliable cycling is obtained.
The adjustment sleeve on the SAFN is easily crushed, so be careful with the pliers! There is a proper TOOL for this job, but the little sleeve itself is made so that you can do the adjustment ith the bullet-point of a Ball round.
This is the same adustment system as on the FAL. It's just that the FAL is made so that the gas-bleed may be adjusted without partially-disassembling your rifle!
Your rifle is mangling and throwing brass. You need to OPEN the gas bleed a bit.
Hope this helps.
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