This was on Tubi and looked worth a try-
The movie starts out violently but with the main bad guy in shadow, then moves to a more current time and the same over-the-top violence occurring, but the bad guy is obvious.
There's a teen in the movie and it is expected that other teens will watch, but the levels and intensities of violence at the start is ruthless and unnecessary imo to establish that the bad guy is bad. He proved that when he wanted someone killed in his crew that was untrained and an easy mark. That's it- then the movie could have proceeded from there and worked great. The violence to Lars' character would have been better done in flashes of memory. Then teens could watch the rest of the film with various homage to Leon, John Wick, Karate Kid- and other favorites, i'm sure.
There are a couple big plot holes, esp the kid being trained so well, bad guys missing shots at nearly point-blank range, attempts at religion and emotional range- but the story is engrossing enough to help you get past all that.
Lars is stellar and made it look easy. For me, he came out of nowhere and reminds me of a young Lance Henriksen. I expect we'll see more of him in the future.