I second the Madd Macs base as they are the lowest I have found.They are boringly reliable with good ammo, I run CCI SV in pretty much everything, and almost always suppressed, my MK4 never jams even with an astounding amount of fouling in the action. Out of the box they are great, add a VQ trigger, get rid of the mag disconnect, and it's the best. They run well suppressed, nice and quiet, easier to strip and clean than earlier models. If you want to run a red dot, the pic rail is kinda tall, I did a madmacs base and R0 I had laying around, bottom 1/4 co-witness with a .470 FO Dawson front sight and stock rear. Run it on pin and steel matches, and it's fun as hell, really easy to shoot fast, great VQ trigger and lines the sites up fast and natural. View attachment 384249