I've disassembled the bolt and degreased/cleaned it and very lightly oiled it before reassembly. There was a lot of oil in there so perhaps the excess oil was causing a hydraulic effect preventing full firing pin protrusion. If that doesn't fix it I'll swap whole firing pin assembly with spring and shroud etc. from my other gun into this bolt and see if that fixes it. If not then swap the original trigger back in and see if it is indeed the Timney causing it. Will waste a heap of ammo in the process no doubt but ah well what can ya do.
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