LAR Grizzly Big-Boar .50 BMG

[Gunmaster45]

I had one of these in my dad's shop the other day, the customer wanted to have it cleaned because the person he was buying it from gave it to him to sample before he'd buy it, so he wanted it in top shape. My dad showed it to me and I must say it's pretty damn heavy, he made me hold it for a good 20 minutes while he cleaned up his counter to put it down and my arms got pretty tired after that. Shouldering it is not nearly as easy as they make it look in The Lost World: Jurassic Park, nor is loading it, because the bolt removes from the gun (meaning one hand holds the 30+lbs of rifle while the other fumbles with the shell and bolt in hand). Sadly I didn't get to shoot it because the customer decided not to buy it from the guy, which really pissed me off because I definitely wanted to.

But this makes me wonder, do they ever use lighter versions of these guns in movies? Or maybe even just in The Lost World, because people could shoulder those .50s really easily, and the bolts looked modified because they stayed attached to the gun, and had a slider so the needle of the tranq. darts didn't miss the chamber.