(I'm referring to the part in which the barrel is mounted on a break barrel.) I have noticed that, on many newer guns, the block is slightly higher than the compression tube while, on older guns such as the Diana 27, the block is flush. I first thought it was to cut out a machining or fitting step to save costs, but the transfer port and bore still have to be aligned, so there's no savings in making the block a little over-sized. Could it be a case of one-size-fits-all so they can use the same piece on guns with varying compression tube diameters? It's a only a little thing (as Benny Hill used to say) but cosmetically it does make a difference.
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