AR-15 / M4 Empty Rifle Chamber Block

AR-15 / M4 Magwell Chamber Safety Block

High-heat construction. Clear visual confirmation. Stable upright support.

The Bull Craft AR-15 / M4 Magwell Chamber Safety Block is a durable empty-chamber indicator designed for range use, training, competition and firearm displays. After the rifle has been unloaded and physically cleared, the block installs through the magazine well with the bolt locked to the rear, providing an obvious visual indication of the rifle’s condition.

Unlike basic chamber flags and low-temperature printed blocks, the Bull Craft safety block is manufactured from high-heat-resistant material designed to withstand contact with a freshly fired rifle without easily warping or melting.

Key Features

• Provides a clearly visible empty-chamber indicator for AR-15 and M4-style rifles
• Installs through the magazine well with the bolt locked to the rear
• High-heat-resistant construction for demanding range use
• Extended support base allows the rifle to stand upright on a suitable flat surface
• Useful during cold-range conditions, training classes, competitions and firearm displays
• Paintable surface for high-visibility or organization-specific colors
• Black standard finish
• Undyed grey finish available for customers who intend to paint the block
• Designed and manufactured by Bull Craft Industries in Florida, USA

Compatibility

• Designed for .223/5.56 AR-15 and M4-style rifle platforms
• Installs through a standard AR-15-pattern magazine well
• Not confirmed for AR-10, AR-9/PCC or other non-standard magazine-well dimensions

Confirm compatibility before ordering if your lower receiver uses a non-standard, heavily flared or proprietary magazine well.

How to Use

1. Point the rifle in a safe direction and remove the magazine.
2. Lock the bolt carrier to the rear.
3. Visually and physically inspect the chamber and magazine well to confirm they are empty.
4. Insert the chamber safety block through the magazine well.
5. Confirm that the block is secure and clearly visible.

The extended base can support the rifle in an upright position on an appropriate flat surface. Always confirm that the rifle is stable and cannot be knocked over.

Important Safety Notice

This product is a supplemental visual safety indicator. It does not unload or clear a firearm and must never replace proper firearm handling, chamber inspection or range procedures.

Always treat every firearm as loaded until you have personally confirmed otherwise. Remove the safety block and inspect the rifle before loading or operating it.

What’s Included

• One Bull Craft AR-15 / M4 Magwell Chamber Safety Block