Hi Michael and welcome. The LCP II has better ergonomics, better trigger, better sights and easier racking slide. LCP magazines will work in the LCP II but will not lock the slide back on last shot so stick with the LCP II Magazines on the LCP II. Cheers and stay safe!

LCP II 1. Better sights 2. Better trigger 3. More accurate 4. Extended mag included The LCPII is also slightly heavier

Michael, The Ruger LCP II is built off of the initial success of the fantastic Ruger LCP with a few important improvements.
The first improvement is the re-designed, texture grip frame which provides you with a secure and comfortable grip with a larger grip surface to provide the shooter with better distribution of recoil forces, meaning less felt recoil. The new, easy-to-rack slide design means that the gun is an option to more shooters. The last round hold-open feature means that the manual of arms of the Ruger LCP II is comparable to its larger brothers and sisters and is something that other pistols in this class do not possess. The integral sights also benefit from an upgrade and provide the LCP II owner with a superior sight picture.
.
There is also the LCP Max, which gives you 10 +1 capacity instead of 6+1. budsgunshop.com/product_info.php/products_id/138984/ruger+lcp+max+.380+blued+2.75in.+10rd ,
.
Stay safe & have a great day!