Windham Weaponry's RP9 AR pistol features a flattop receiver forged from 7075 T6 aluminum with an aluminum trigger guard, and a manual lever safety with dual-sided indicator markings. This semi-automatic uses a gas impingement system, and has a 4150 Chrome Moly Vanadium 11595E steel barrel with a medium profile, 1:7" twist, A2 flash suppressor, and M4 feed ramps. It has a Windham's 7" free-float railed handguard, Kriss polymer front and rear flip sights, and Hogue beavertail pistol grip. It is fitted with an SB Tactical pistol arm brace, including a QD endplate and QD sling swivel. This 300 Blackout model has a 9" black melonite QPQ-finish barrel, black hardcoat anodized receiver with laser caliber identification, a Magpul Enhanced trigger guard, and black furniture. It includes a 30-round magazine and comes packaged in a hard plastic gun case.