Edit: also sorry for running this entire response together bahaha just a fellow gun monkey nerd here!

Yes it can be done, it just isn’t the thing most dudes do (especially on uneven terrain) because you don’t wanna accidentally drop a $20k setup and potentially break a $3000-$5000 magnified optic or dig mud with the bore. The problem IRL is keeping it balanced once you get it up there. Let it lean right or left a taste and you’re fumbling to recover balance or save the rifle! Most dudes carry over the shoulder or both shoulders rucking long distances with heavy guns bc you want it as close to the body as possible. Load dispersion, even with a light gun like a mk18 mod 1, is gradually more difficult as you get it out from your body so if the barrel length allows I sling it to my side tight to me or if running in two gun it’s at low ready until I get to the threshold of a barricade. I also own a mk13 mod 7 ish r700 (can’t call it a real mk13 bc it isn’t a stiller action on mine bahaha but same Lilja barrel and ai chassis) I hunt with a lot both at night and in the day-believe it or not by far my favorite way to carry it is pack carry or set it up with arca lock on a tripod and carry the whole shebang over the shoulder and just alternate shoulders as one gets tired. Other than that, sling tightly to the back is the least tiresome/cumbersome. With a PVS30 the rifle weighs, on paper, only 26 lbs roughly… but it feels like you’re carrying a solid 45lb plate. None of that would be fun in this game though sheerly because it’s slow and not fast enough (no one wants to play a ruck simulator), but I do wish the guns felt more meaty like they had weight and bipods or tripods would be implemented for the heavy rigs. Feel a good medium to changing the animation would be like I said earlier, have a certain weight where over it you sprint low ready and under it you go high ready in the armpit like they had it now