If you're looking for the perfect touch to personalize your S&W M&P 15-22, NDZ Performance has one of the nicest charging handles I've ever come across. They'll even personalize it with a printed graphic like the squirrel on mine. The quality is top notch with laser-printed graphics. It has a "tactical latch" on the left side. It's fully assembled, made from aircraft grade aluminum, has a hard-coat anodized milspec anti-reflective/glare finish. It's so much nicer than the junk plastic piece that comes stock.
Squirrel hunting with the 15-22. Note the tactical latch on the charging handle.