I use Winchester subsonics and mine cycles very reliably. It has a suppressor. In fact, it eats anything really. Just needs to be clean. When cleaning I do put a whiff of graphite powder on the spring rod so the charging handle slides nicely. It's about 35 years old which might also explain why it cycles reliably (well broken in)
I'm intrigued by the buffer comments. I presume you use a polymer buffer to quieten the cycle?
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