Installing an AR-15 Barrel

by
posted on May 24, 2011
** When you buy products through the links on our site, we may earn a commission that supports NRA's mission to protect, preserve and defend the Second Amendment. **
d10764.jpg

Parts

BarrelBarrel nut

Tools

DPMS Multi-Tool or other barrel wrenchBrownells upper-receiver action block with insertTorque wrench with 1⁄2-inch driveBench-mounted vise

The YHM free-floating fore-end I chose for this build came with a barrel nut. The following instructions are for installing the barrel using this hardware and are typical for fore-ends of this type. However, the process may vary a bit with other models.

Image
The Brownells upper-receiver action block and insert help secure the upper for installing the barrel and other components. Put the insert in the action, put the action in the block and clamp the block in a vise.

Slide the action-block insert inside the receiver to support it and prevent distortion under pressure. Then clamp the receiver in the action block, and secure the works in a bench-mounted vise.

Clean the receiver threads with a small brush, and coat them with an anti-seize compound or high-quality grease. Insert the barrel through the front of the receiver. Thread the barrel nut onto the receiver with the wide, threaded portion to the rear. Tighten the barrel nut using a DPMS Multi-Tool or other barrel wrench.

The Multi-Tool is designed to be used with a 1⁄2-inch-drive torque wrench. The mil-spec tightening technique is as follows: Torque to 35 foot-pounds. Loosen. Torque again to 35 foot-pounds. Loosen again. Torque past 35 foot-pounds, until the next hole in the nut aligns with the gas-tube hole in the receiver, but do not exceed 80 foot-pounds.

Image
After aligning the barrel with the receiver and installing the barrel nut, use a torque wrench in conjunction with a barrel wrench to properly tighten the nut.

Latest

Steelhead Outdoors' Limited-Edition Founders Pistol Lock Box
Steelhead Outdoors' Limited-Edition Founders Pistol Lock Box

First Look: Steelhead Outdoors' Limited-Edition Founders Pistol Lock Box

Finished with in patriotic royale blue and crimson red colors.

Mechanical Advantage

There are two things which cause you to miss. Here's how to correct both of them.

First Look: Mission First Tactical 5L Achro Sling Bag

Keep your gear on you without standing out from the crowd.

First Look: Streamlight SL-SideSaddle Light

Add a little light to your hat or helmet.

NRA Foundation Grant Program Fueling the Future

In 2024 alone, The NRA Foundation awarded $8.6 million in state fund grants.

Interests



Get the best of Shooting Illustrated delivered to your inbox.