Layout D - Upper Authority

Layout D (comb with C + load more)

person cleaning the interior of an AR-style rifle upper receiver with a brush

Maintenance

AR Maintenance Basics: Keeping Your Rifle Reliable...

Close-up of an AR-15 bolt carrier group showing the gas key and bolt assembly on a white background

Bolt Carrier Groups • Equipment

Best Budget BCG Options for Reliable AR Builds

Two AR-15 upper receivers shown side by side, PSA on top and BCM on bottom, both with 16-inch barrels and M-LOK handguards

Equipment

PSA vs BCM Comparison: Which AR-15 Brand Fits Your...

Partially assembled AR-15 with upper receiver, lower receiver, bolt carrier group, and magazine on a workbench

Builds

Budget AR Build Guide: Smart Parts and Cost Breakdown

Complete AR-15 upper receiver assembly with handguard and barrel on a neutral background

Equipment • Upper Receivers

Best AR Upper Receivers by Use Case

Close-up of an AR-15 upper and lower receiver separated at the takedown pins

Upper vs Lower Receiver: Key Differences Explained