"...approximately 44 inches."
I assume that is a typo, because the barrel is 24 inches long. However it cannot be separated from the action, which increases it's length to at least 30". The stock is also a single piece of wood, approximately 30" long. These are also not simply thin tubes, the stock being no less than 2" thick and the butt ~6" wide, while the action and scope are ~6" wide as well.
Glover is correct that after disassembling the rifle you would have to sight it in again, and there was clearly no opportunity to do that on the roof. If that was Tyler jumping off the roof on video, he wasn't carrying the rifle, broken down or not. The thing about repeatedly changing clothes strikes me as useless as a security measure, but that narrative could cover for other people involved, and that was my first thought when I heard he'd changed clothes repeatedly.
Thanks for an excellent report!
Edit: I hadn't realized you had made a video but had only linked it here, glossing over the opening of the OP I guess. My bad. Watching the video now, and it is far more wide-ranging and substantive than the text above in the OP. At 1:24:45 you ask what something is, and I think it's an automatic beacon for boaters that you attach to a keyring and it prevents your keys from sinking while flashing a red light so that you can locate them if you are not safely boating with keys in pocket, or to hand. If your boat capsizes or something happens that puts you in the water, this both alerts rescuers to your approximate location in the darkness and reduces the hassles of recovery from the disaster you've survived. Imagine being rescued by the Coast Guard after your boat sinks, and you don't have keys to your vehicles, home, workplaces, and etc. This was to solve that problem (I think), and enable the Coast Guard to locate you at night in rough seas.
It sucks to drop keys in the ocean. I've done it, and it was actually transformative to my life at the time, as the keys I lost were to my father's boat, and that ended my use of any vehicles of any kind he owned for the rest of my life, as it should. I was a horrible child (or, rather, horribly missparented). The first time I ever drove at 12 I snatched my mother's keys while we were visiting a friend of hers and ran outside to start the car when we were leaving, and (since it was a manual transmission in gear while parked to keep it from rolling on a slope) I smashed into some garbage cans and was humiliated. Instead of teaching me how to drive, my father kept me away from vehicles as best he could, so I would steal his every chance I got, once using his Honda XL 75 motorcycle to (try to) jump his 1964 Dodge Power Wagon Pickup, and wrecking both of them (and my knees and elbows) instead. This is basically why I lost my father's boat keys, because I was out buzzing the Ferry and drinking with some buddies in his boat while he was out of town.
Coincidentally, this is why I homeschooled my kids, and enabled them to buy their own vehicles at an early age. I taught them to use and gave them access to every tool I could, because I knew what might happen if I didn't, including the log loader that came with the property I raised them on. I realized the things he taught me to use - only firearms for hunting - and enabled me to own myself, like the Remington .22/.250 with a shortened buttstock so I could properly shoulder it prior to puberty, were the only things I didn't just steal to gain access to and learn to use myself. Because my kids purchased, with wages they earned doing hard construction labor, their 4x4's they drove on the cat trails on my acreage, and had to repair them themselves when they wrecked them at 10mph, from the age of ~10, when they turned 18 I knew they were quite risk avoidant while driving (and had learned all the ways they could crash), and I had little fear they'd do all the stupid shit that gets teenagers killed when they learn how to drive at 16 and borrow their parents cars. I was familiar with all that stupid shit because I somehow survived doing it, and knew how handling the expenses it caused created a strong disincentive to do stupid shit (even if you survived it) because my dad wouldn't let me get a license before I turned 18 whereupon I bought my own car and learned not to do all that stupid shit by doing it at my own expense.
Had I had that little beacon keyring when I was a 15 year old miscreant, my life might have turned out very differently.
The speaker thing is for Drive-ins. Outdoor movie theaters needed to provide audio to each vehicle in the drive-in, so at each parking space there was such a speaker mounted on a post. They used similar speakers with microphones so you could order at Carhop restaurants like A&W, where a pretty girl on roller skate would deliver your order on a tray that hooked to your car door with the window rolled down.