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It's not great with small quantities. I use it maybe 5 times per year which is why I wondered what OP wanted to grind in a M&P. I would probably only use a MP 5 times a year at the most.
Mine is a Cuisinart that I bought about 15 years ago like this. [link]
I don't have one, it might work. Try it and report back!
Otherwise blade grinders are common at Goodwill I think, or pretty cheap new. This is the one I use, it was my wife's in college, but she's since upgraded.
I've used an electric coffee bean grinder I got from the grocery store for several years. It was only ~$20 and it reliably gives me a nice grind in 20-30 seconds.
Edit: this is the grinder I use, only difference is mine's black - Cuisinart DCG-20N Coffee Bar Coffee Grinder, White [link]
it's discontinued but there's about a million versions of it, works perfect