Book excerpt: Maintain and Set Up Your AR-15! Whether you're a beginner who is new to the AR-15 or are an intermediate shooter, you'll find everything you need to know to keep your AR-15 operating smoothly in AR-15: Guide to Setup, Maintenance & Repair. Written by master gunsmith and best-selling AR-15 expert Patrick Sweeney, AR-15: Guide to Setup, Maintenance & Repair is your one-stop guide to repairing, maintaining, and modifying America's favorite rifle. It's all here! Hundreds of detailed photos Step-by-step maintenance & repair Accessories & modifications Tips, tools & techniques And more! Whether you're interested in disassembling and maintaining your AR rifle, or you're ready to rebarrel or convert it to a piston design, AR-15: Guide to Setup, Maintenance & Repair tells you everything you need to know. From field-stripping to keeping an AR functioning at its peak no matter how harsh the environment, Sweeney gets under the hood with you to keep it running.