Upgrading the S&W M&P10

Published on March 9, 2026
Duration: 62:38

This video provides a comprehensive guide to upgrading a Smith & Wesson M&P10 rifle. It details the step-by-step process of replacing the stock, grip, trigger, buffer tube assembly, handguard, gas block, and muzzle device. The instructor also covers the installation of accessories like a bipod, charging handle, and iron sights, demonstrating advanced gunsmithing techniques for a large-frame AR platform.

Quick Summary

Upgrading a Smith & Wesson M&P10 involves replacing key components like the trigger, stock, and handguard. Key steps include removing old parts, installing new ones like a Geissele trigger and Midwest Industries handguard, and ensuring proper staking of the castle nut for reliability.

Chapters

  1. 00:08Introduction & Overview
  2. 01:00Removing Old Furniture (Stock & Grip)
  3. 01:51Removing Stock and Take-Down Pins
  4. 03:45Removing Grip and Lower Receiver Components
  5. 05:01Removing Trigger and Hammer Assembly
  6. 06:38Removing Buffer and Receiver Extension
  7. 07:26Lower Receiver Upgrades: End Plate & Castle Nut
  8. 10:07Staking the Castle Nut
  9. 13:05Installing New Trigger and Hammer
  10. 19:51Installing New Grip
  11. 23:03Installing New Stock
  12. 25:05Upper Receiver Prep & Handguard Removal
  13. 27:30Removing Barrel Nut and Gas Block
  14. 30:57Barrel and Receiver Extension Lubrication
  15. 32:24Installing Barrel Nut
  16. 37:50Installing Gas Block and Gas Tube
  17. 40:24Installing Handguard
  18. 43:11Installing Muzzle Device
  19. 44:51Installing Iron Sights
  20. 49:59Assembling Upper and Lower Receivers
  21. 50:19Installing Charging Handle and BCG
  22. 51:40Installing Bipod and Grip
  23. 55:07Installing Suppressor
  24. 55:34Installing M-LOK Rail Covers
  25. 57:17Installing Optic
  26. 58:25Range Test & Performance Evaluation

Frequently Asked Questions

What are the key upgrades for a Smith & Wesson M&P10?

Key upgrades for the S&W M&P10 include replacing the stock trigger with an enhanced model like the Geissele G2SE, installing a free-float handguard such as Midwest Industries, upgrading the stock to a Magpul DTPR, and adding accessories like a SureFire flash hider and an ambidextrous charging handle.

How do you stake a castle nut on an AR-10?

To stake a castle nut, first ensure it's properly tightened. Then, use a staking tool to deform the end plate into the castle nut's notches. This prevents the nut from loosening due to recoil and vibration, a critical step for safety and reliability.

What is the importance of matching handguard shelf height to the upper receiver?

Matching the handguard's shelf height (low or high) to the upper receiver's profile is crucial for proper alignment of the top rails. Mismatched heights will result in misaligned rails, affecting aesthetics and the ability to mount optics correctly.

Why is Rocksett preferred over Loctite for muzzle devices?

Rocksett is preferred over Loctite for muzzle devices, especially when a suppressor will be attached, because it offers superior heat resistance and can withstand the forces involved in suppressor mounting without degrading.

What are the benefits of a free-float handguard on an AR-10?

A free-float handguard improves accuracy by eliminating contact between the handguard and the barrel, preventing external pressure from affecting the barrel's harmonics. It also provides a more stable platform for mounting accessories.

More Gunsmithing & DIY Videos You Might Like

More from Brownells, Inc.

View all →