Hmmm. Well my sar-1 had a ftf,first one in about 500 rnds.It usually is reliable as hell.Here is what happened loaded 10 rnd mag, racked the bolt and tried to fire and click!!So I waited and then investigated.Last time this happened the sear broke(due to RSA overhardened Mat'L)they sent new FCG out to replace it(great serv..)anyways it appeared the primer was barley dimpled.What would cause this? hard primer maybe,gunk on the FP.I dont know if it is just me but it seems like the hammer doesnt hit the pin as hard as it used to..It is the RSA adj. Fcg.I havent investigated totally yet.Just curious about the primer theory..Oh it was Wolf ammo by the way.Let ya know what I find