I started a similar thread a few days ago.
My main question was would a cheaper, more flimsily built break barrel result in a shorter transfer port, inadvertently making it more efficient, whereas some of the more chunkily and solidly engineered rifles have a longer TP, owing to their robust build philosophy?

How short (in other words how thin could the cylinder end wall be) could we have the TP and still retain strength and reliability? Some of the answers that were coming back did indicate that quite a few break barrels do indeed have quite short TPs.

I suppose that, as long as the internals are properly set up and balanced and we're not getting piston slam, this shouldn't be an issue?