I've lost count of how many RFI 2A and 2A1 rifles I've had through my shop for fitting of long bolt heads. I'd say 90% of them regardless of condition are all out of specification. I've always fitted new, long bolt heads and adjusted them to L42A1 specification which is tight as a tick. I didn't use an SAAMI Field gauge because I know that the 7.62 NATO round is stressing the receiver to the maximum of it's capability and tighter is obviously better. We've all read before about the metallurgy and the mythology of the receivers being manufactured from higher quality steel. When properly tested, the mettalurgy was found to be exactly the same as WW1 production SMLE receivers! Remember too that the 2A and 2A1 were never intended to be front line combat rifles. Positive extraction and ejection from the magazine is modest at best and they were mostly issued to frontier territorial and police forces not the regular Indian Army. I like to refer to them as "Barney Fife" rifles. "Here's your rifle Sahib. Here's your bullet. Please put it in your pocket until you really, really need it".