Dagomob

Thank you all for the info. I'm going to try for a fairly snug, without being insanely tight, fit. I'm figuring that the interference fit that I will aim for will be somewhere around .0015-.0020". That, with the pins, should be quite sufficient to keep the block snug and in place. I will still need to beat it back on, but hopefully not as violently as was the removal. Thanks for all of the input, and I'm sure I'll have more questions in the future.

Thanks for the suggestions on how to make the block diameter a little bigger. This is the kind of information that I was looking for. Do you have any recommendations as to how much of an interference fit that I actually need. I know that it took an air hammer to get the thing off in the first place, and I would think that that would be rather excessive, considering that the block is held on with pins in the first place.

Hi all. Fairly new member here, and I have a question about the fitting of the gas block to the barrel on an S12. I know that these are press fit , and I am wondering if anyone knows what the tolerances should be between the block inner diameter and the barrel outer diameter. My gas block was a real pain to remove, unlike some others that I have heard of, and I was wondering if I should try to sand down either the barrel or the inside of the block to make the fitment a little more manageable. At this time, my block i.d. is +/- .9035", and barrel o.d. ranges from .9060 -.9090" front to rear.

What might the guys in R&D have to say about the barrel bore diameter of the above mentioned S-12? I am already assuming that there will be variances in the factory spec measurement, but finding out what the inner diameter roughly should be would be a great help to me.