No, it will not. The included magazine is an AICS 308 pattern magazine, you would need a AICS small base variant.
This stock will fit your rifle, however the Mini-30 magazines will not fit this stock, you would need an AICS compatible magazine.
Please email us at techsales@opticsplanet.com so we can further assist you with your question.
I recommend using the magpul magazines.
Yes, that firearm is compatible.
Yes, it will fit a Ruger American in .350 Legend, but please be aware that there are no companies I am aware of that are offering .350 Legend AICS Compatible magazines.
I had the same issue with my 6.5 Creedmore Ruger American Predator in the Magpul Stock. I contacted Magpul to see if there is a fix. I was told to pull the bolt back as far as it will go, then rotate the bolt 180 degrees. It will then come out without removing the riser.
You would need an AICS compatible magazine. Unfortunately Magpul does not make an AICS magazine for .300 AAC, so you would have to find an aftermarket option.
The correct stock for a 300 Blackout Ruger American would be the Magpul Industries Hunter American MAG1207 Stock, which can be found linked below:
https://www.opticsplanet.com/magpul-mag1207-blk-hunter-american-stock-black-adjustable-synthetic-stock-with-a.html
yes. it comes with a 5 round pmag.