12 volt...Ruger makes just as good varmiters and they are very reasonable in cost. What Im getting at is that I bought a M77 in 223 that is boringly accurate. I didnt go the expensive route, I bought a tasco 6-24x scope and a harris biopod, got 90 in the scope new and 55 in the pod used at a show.I later put in a adjustable trigger at 35 bucks.I have 450 in the gun new plus the things Ive added and I cant complain about its accuracy nor reliabilty one bit. Ruger includes steel scope rings for this gun in the box as it had no irons on it. Ruger also makes some very accurate single shots that are somewhat more pricy than a M77 but as far as Im concerned, they are top of the line as well. Its all in what you want the gun to do and how it needs to look. but for varmits..its the one rifle that I know will do the job. I have a bushmaster in a heavy barrel also,but its strictly a fun gun though an accurate gun.I didnt want to spend alot of money on special mounts and optics for the bushmaster so I bought the M77 strictly for varmits.
varmiting is a great sport,pick your gun then optics if you want them then try different loads to see which is best for you.