This is a Smith & Wesson AR known as the M&P15-22 chambered in 22 LR, model 10207.
The M&P15-22 SPORT features a 10-inch M&P slim handguard that incorporates the popular Magpul M-LOK(TM) system. The M-LOK system allows rifle owners to easily customize their M&P15-22 SPORT by adding accessories without removing the handguard.
Features:
10†M&P® Slim Handguard with MAGPUL® M-LOK
MAGPUL® MBUS® Folding Sights
Fixed Stock
