It seems that I was on a bit of a firearm purchase frenzy - two new guns in the same week. Not usual for me. I thought as I looked the two guns over, read thier manuals, disassembled & cleaned how polar opposite these guns are. The North American Arms Earl .22/.22Mag was based on the old American revolvers of the late 1800's & the Sig Sauer 556R (Russian) was based on the Russian 7.62 x 39mm round. It's viewed as some as a fairly modern firearm. I look forward to shooting both!