What about a long barrel on a short barrel cylinder?
I ran it to the question in the process of upgrading from my TM G36C to the G36K (see sig). Here is I what I came up with after a lot of thinking and visualizing. (Unfortunately I didn't have any chrony tests.):
Since the compression cycle is starting later because of the port, the bb won't be receiving the proper volume of air compared to the barrel perhaps a slight drop in FPS. Also the piston will start moving back before the bb has left the barrel, so you will get some suck back on it.
I may be completely off. What do you guys think?
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