yes. I meant "Perhaps the extractor or ejector spring". I haven't played with either on a carbine. I know there is the added dynamic of the slide handle geometry, but otherwise the principles of ejection are analogous to most anything else mechanics-wise. 1911's I've tuned the ejection on plenty. Changing the ejection pattern is combination of the geometry of extractor (how tightly it holds on to the case) and the force at which it strikes the ejector stud (the balancing the buffer spring and recoil forces on a 1911) - or analogously the ejector spring force on the carbine.
...reading your thread now.
---------- Post added at 03:28 PM ---------- Previous post was at 03:24 PM ----------
LOL...if only carbine brass were as cheap today! I guard mine like gold, and I certainly never go M1carbine shooting without a kiddo or three to take turns scrambling for it as it falls. I scored a case of PPU 110gr. a couple years ago at a good price. Berry's is starting make/have in stock their 30cal plated round nose again - so I'm all set but for large quantities of brass.