New member here and mini newb. I plan to buy one when the prices settle down. I intend to get a ranch rifle. Other than the serial number beginning with 580 are there any other number designations I should look for to ensure I get a gun that has the latest improvements? In December I anticipated new gun legislation here in Maryland and I snatched up four 20 round ruger mags. Since then they've banned ARs and limited mags to ten rounds, but mine are grandfathered. So, I'm committed to the rifle and hoping to get a good apple. Any advice would be appreciated!