If you're new to purchasing firearms or lower receivers online, the process might seem a bit overwhelming. At Aerospace Arms, we're here to make it as simple and straightforward as possible. Below, we've outlined a step-by-step guide to help you successfully order your firearm or lower receiver a …

Building an AR-15: A Builder’s Parts List & Complete Guide Last updated: September 2025 • Author: Aerospace Arms In this guide: Introduction AR-15 Build Considerations Lower Receiver Parts List Upper Receiver Parts List Choosing an AR-15 Barrel Bolt Carrier Group (BCG) Gas System Ha …

As most of us know, the most common questions tossed around in the AR community when building custom AR-15s are, “How do I build the lightest AR-15 possible?” or “What’s the best ultra-lightweight AR-15?” or “Where can I find the lightest AR-15 parts?” or some version of this question.  Who …