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The ruger pc carbine comes with a magwell installed tha accepts the security 9 mags and one to accept glock mags, an adapter to accept ruger American mags (like the one uiu asked about) require a 3rd maxwell not included but can be purchased here https://www.brownells.com/rifle-parts/receiver-parts/magazine-parts/magazine-hardware/ruger-pc-carbine-mag-well-inserts-prod114123.aspx
Howard, yes Sir. Ruger makes a Ruger Magazine Well adapter. The Security 9 Magazines will work no issue. https://shopruger.com/Ruger-PC-Carbine-Magazine-Well-Insert-Assembly-SR9-_-Security-9/productinfo/90653/ Cheers and stay safe!
You NEED AN ADAPTER for this magazine to work. Get ruger magazine well adapter HERE ( brownells.com/rifle-parts/receiver-parts/magazine-parts/magazine-hardware/ruger-pc-carbine-mag-well-inserts-prod114123.aspx ) I hope this helps!
The Ruger 9mm PC Carbine comes with a magwell installed that accepts all SR Series and Security 9 magazines of any capacity; the extra magwell is for Glock mags. Do you already have Ruger American pistol series mags? If you do order the American magwell from Ruger. If you do not, get either SR or Security mags and the will fit right in and function perfectly. I use both SR & Security mags in my 9mm PC Carbine.