There are photos and a video of the new, working LEGO Sniper Rifle by Kevin183.
The author claims that he used 1235 blocks to build his rifle. Another 70 Lego parts were consumed by making the ammunition. The project's budget closed at 150 EUR, including shipping costs. The Youtuber sells instructions to build a new sniper rifle for 20 EUR- Lego Sniper Rifle
Maybe it's worth building stuff from LEGO during the epidemic?
Sources: popularairsoft.com, mocsmarket.com