I bought the RCBS presision mic not knowing what to expect. It is a bit awkward at first, but its not to bad. I had to manually insert the tool on my rifle, as it just got pushed forward by my extractor. The instructions mention it. It must rest on the bolt face. It works as advertised. A bit tedious, but gets the job done. At least I know I wont have headspace issues instead of just assuming.
Pros: It does what its supposed to do.
Cons: A bit awkard at first....
Would recommend: Yes
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