I never bought a 9mm rilfe because there are a bunch of other rifles I would rather have. Although the Henry Homesteader 9mm in the American Walnut stock has been a temptation.
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I picked up one of the Rugers, as I ran into a deal on one. It's fun, and cheap to shoot, but way too heavy for what it is. It's basically an up-sized 10-22. I made things worse by cobbling a PPsh 41 stock onto it. That is really heavy. I did get the necessary conversion bits cheap, and can switch it back to the original chassis version in minutes, so I don't feel too guilty.
Ruger can only use its native mags and its adapter for Glock 17 &18 Mags. The Henery comes with its native mag and adapters Glock, Sig Sauer, or Smith & Wesson magazines. Not that any of that would matter to me because I don't own a Glock, and doubt I would use any of my handgun mags with the rifle. I tend to buy mags just for the firearm.
Well...yes. If you actually compare you can find a couple others that adapt easily. The M&P S&W mags go right in.
You may need to add the mag catch hole but that's nothing. Like changing mags between PT99 and Beretta 92/96. Just a bit of careful work. Also the hi cap Glock mags and drums make those Rugers way better.
I have a couple of Marlin 9mm camp carbines for sale here. They are pretty fool proof and use S&W magazines. I had to replace the old plastic buffers in the rear of the receivers. They're good to go.