Please stop with this cheap garbage.... Are you serious with this upper?!

Published on January 21, 2018
Duration: 3:20

This review critically examines the Bushmaster Carbon 15 polymer upper receiver, highlighting its significant structural integrity issues. The speaker demonstrates how the bolted-on metal Picatinny rail detaches from the polymer, posing a serious safety hazard. The video strongly advises against using polymer for AR-15 upper receivers due to excessive stress and potential for dangerous failure, recommending traditional aluminum construction instead.

Quick Summary

The Bushmaster Carbon 15 polymer upper receiver is criticized for dangerous structural flaws, specifically its bolted-on metal Picatinny rail stripping from the polymer. This design is prone to failure under stress, making polymer uppers unsafe for AR-15 platforms compared to traditional aluminum.

Chapters

  1. 00:00Intro: Budget Builds & Joke Uppers
  2. 00:42Bushmaster Carbon 15 Overview & Flaws
  3. 01:29Structural Integrity Issues Demonstrated
  4. 02:20Safety Warning: Avoid Polymer Uppers

Frequently Asked Questions

What are the main problems with the Bushmaster Carbon 15 polymer upper receiver?

The Bushmaster Carbon 15 polymer upper receiver has critical structural integrity issues. Its polymer construction combined with a bolted-on metal Picatinny rail leads to stripping and separation, making it prone to dangerous failure under stress.

Why are polymer upper receivers generally considered unsafe for AR-15s?

Upper receivers endure significantly more stress than lowers. Polymer uppers, like the Carbon 15, can flex excessively and fail catastrophically, potentially causing injury. Traditional aluminum construction is far more reliable and safer for this component.

What specific design flaw makes the Bushmaster Carbon 15 upper receiver dangerous?

The primary flaw is the metal Picatinny rail bolted directly onto the polymer receiver. This connection point is weak and prone to stripping, leading to the rail detaching or the receiver itself failing under operational stress.

What material is recommended for AR-15 upper receivers instead of polymer?

For safety and durability, aluminum is the recommended material for AR-15 upper receivers. It provides the necessary strength and rigidity to withstand the stresses of firing and accessory mounting, unlike polymer.

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