Apologies in advanced if this has all been covered before, first thing, barrel nuts, is selecting the right size a simple matter of changing sizes till ones too tight to lock up then moving back one size? If not what's the correct procedure? Next, locking shoulders, I understand there are eight or so sizes but was there a more common size, if you don't readily have access to a full set where is the best place to start? Is there a way to measure what size is required (like with the L1A1) or is it all trial and error. Lastly locking shoulders weren't calibre specific were they? Same part .303 to L4? Any info appreciated.

Daniel
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