Bushmaster ACR: Field Strip & Internal Review

Published on December 11, 2019
Duration: 20:34

This video provides a comprehensive guide to field stripping and reassembling the Bushmaster ACR. It details the removal and reinstallation of key components including the lower receiver, stock, charging handle, bolt carrier group, barrel, and gas system. The instructor highlights similarities to the AR-15 platform while pointing out unique ACR features, offering practical tips for each step of the disassembly and reassembly process.

Quick Summary

The Bushmaster ACR can be field stripped by removing two pivot pins to separate the upper and lower receivers. Its non-reciprocating charging handle disconnects via a button, and the barrel is removed by rotating a collar after engaging a hinge mechanism. The gas system offers unsuppressed, suppressed, and a middle setting for maintenance.

Chapters

  1. 00:00Introduction & Channel Update
  2. 00:49Magazine Removal & Safety Check
  3. 01:41Separating Lower Receiver
  4. 01:53Lower Receiver & Trigger Group Overview
  5. 03:14Rear Stock Removal
  6. 04:29Charging Handle Disconnection
  7. 05:21Bolt Carrier Group Disassembly
  8. 07:53Handguard and Barrel Removal
  9. 10:18Gas System Disassembly
  10. 11:06Upper Receiver Internals
  11. 12:53Reassembly: Bolt Carrier Group
  12. 14:19Reassembly: Barrel and Gas System
  13. 15:39Reassembly: Handguard
  14. 16:01Reassembly: Upper to Lower Receiver
  15. 16:47Function Check
  16. 17:09Bonus Gun: B&T VP9
  17. 18:31Outro & Social Media

Frequently Asked Questions

How do you separate the lower receiver from the upper receiver on a Bushmaster ACR?

To separate the lower and upper receivers on a Bushmaster ACR, you need to drive out two pivot pins: one at the front near the barrel and one at the rear near the stock. Once these pins are removed, the lower receiver will detach.

What is unique about the Bushmaster ACR's charging handle?

The Bushmaster ACR features a non-reciprocating charging handle, meaning it does not move with the bolt carrier group during operation. It is internally connected and can be disconnected from the action by pressing a specific button within the upper receiver.

How is the barrel removed and installed on a Bushmaster ACR?

The Bushmaster ACR's barrel is removed by engaging a hinge mechanism that depresses a plunger, allowing a collar to be rotated counterclockwise. This disengages threads from the trunnion slots, freeing the barrel for removal. Reinstallation is the reverse process.

What are the different settings for the Bushmaster ACR's gas system?

The Bushmaster ACR's gas system has three settings: unsuppressed, suppressed, and a middle position. The middle position, located between the other two, is where the gas plug can be safely removed for cleaning or maintenance.

More Gunsmithing & DIY Videos You Might Like

More from Arm&Gun

View all →