Complete component set: Factory-matched tolerances for optimal performance Precision-machined receiver: Integrated Picatinny rail mounting system Free-float barrel system: 5R rifling for enhanced accuracy potential Modular stock system: Compatible with standard AR-15 buffer tubes Adjustable trigger assembly: 3.5–6 lb pull weight range Nitride-treated bolt carrier group: Rated for 10,000+ round service life Complete hardware package: Includes all pins, springs, and assembly tools The RMCKR Master Kit streamlines your build process and minimizes compatibility concerns by combining factory-matched components engineered to precise specifications. Each part is produced under Remington’s strict quality control standards, with tolerances maintained within ±0.001 inches on critical surfaces. By providing a complete, ready-to-assemble solution, the kit cuts build time by up to 40% compared to sourcing individual parts. Specifications Brand: Remington Manufacturer part #: RMCKR UPC: 604544702873 Category: Cleaning › Cleaning Supplies Shipping weight: 0.56 lb Country of origin: US Ships fast from GunCycle — free economy shipping on orders $99.99+.