The factory Ruger mags are the way to go. I ordered 2 Promag LCP magazines to save a few bucks, only to find out my extended base plate grip extensions would not allow the Promag mags to seat in the LCP with them on. I had to file down the top of the base plates a lot to get the mag to seat in the gun. The extended grip base plates fit the Ruger mags perfectly & I had no trouble loading them in the gun. Stick w/ factory Ruger magazines if you're using any of the available grip extensions.
Note: I had both Pearce & Garrison extensions, & neither would allow the Promag to seat.
Richard Ross from