The young man Rittenhouse was rightly exonerated of all charges in his acts of self-defense against racial agitators during the 2020 racial insurrection. The gun charge--possession by a minor--was tossed due to the law actually only applying to short-barreled rifles and shotguns. While the SBR provision is arguable on constitutionality (SBS's are sure to be held to be more criminally suited, and there is long-standing jurisprudence allowing for restrictions in that area), this event shows the benefit in actually following the law when it is not an impediment on the core principle of RKBA.
EXPLAINER: Why did judge drop Rittenhouse gun charge? - ABC News (go.com)
Challenge age and SBR laws legislatively if you wish--judicially if you must--but recognize there is legitimate range for men of reason to differ on what is proper in untrained civilian hands in fulfilling the functional need of the Second Amendment. (And there is a "need" in it--the sixth word: TDF 21).