Let's Build a DIRT CHEAP Side Charging AR Upper

Published on November 30, 2018
Duration: 17:46

This video reviews the FM Products AR-9mm side-charging upper receiver, highlighting its affordability and feature set compared to more expensive AR-9 platforms. It details the build quality, including the 4140 steel BCG with S7 tool steel extractor and 4150 CMV barrel, and demonstrates its reliable performance over 375 rounds with zero malfunctions. The review concludes that the FM Products upper offers excellent value for its price point.

Quick Summary

The FM Products AR-9mm upper receiver is a budget-friendly option, costing around $600-$700 for a complete setup. It features a 4140 steel BCG with an S7 tool steel extractor, a 4150 CMV barrel with a 1:10 twist, and reliable side-charging operation with LRBHO.

Chapters

  1. 00:00Intro: Affordable AR-9 Market
  2. 01:17Disassembly & Side-Charging Mechanism
  3. 02:37Bolt Carrier Group (BCG) Specs
  4. 03:38Extractor Durability & Comparison
  5. 04:29Upper Receiver & Barrel Features
  6. 05:45Blast Diffuser & Charging Track Lube
  7. 07:52Range Performance & Reliability Test
  8. 11:20Operating Systems Comparison
  9. 12:32Final Verdict & Value

Frequently Asked Questions

What makes the FM Products AR-9mm upper a good value?

The FM Products AR-9mm upper is considered a great value due to its affordable price point, typically $600-$700 for a complete setup, while still offering desirable features like a side-charging handle, last-round bolt hold open (LRBHO), and robust construction.

What are the key technical specifications of the FM Products AR-9mm upper's BCG?

The BCG is made from 4140 steel with a salt bath nitride finish. It features a ramped design for compatibility with various hammers and includes a removable weight for system tuning. The extractor is constructed from highly durable S7 tool steel.

How reliable is the FM Products AR-9mm upper?

During testing, the FM Products AR-9mm upper demonstrated excellent reliability, firing approximately 375 rounds without a single malfunction. The speaker praised its consistent performance and flat shooting characteristics.

What is the barrel material and twist rate for the FM Products AR-9mm upper?

The barrel is made from 4150 chrome moly vanadium steel, a common choice for durability and performance. It features a 1:10 twist rate, which is suitable for stabilizing 9mm projectiles, and has a salt bath nitride coating.

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