If you're wanting to fix a no.4 rifle Central mounting plate to your rifle flick me a PM as I have a couple sitting around here somewhere.
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I'm certainly not as experienced as others on this board, but I had a similar experience with the last round on mine. It wound up being the magazine. A little adjustment with a pair of pliers and it fed the last round fine.
Sorry about that, I didn't fully read the original post. Didn't realize you were talking about the last round being loaded via the charger rather than the last round coming out of the magazine...