Chamber Blocking Device – Model CBD M-1
Make “clear and safe” obvious at a glance. The Chamber Blocking Device (CBD) M-1 is a high-visibility, tool-free insert that blocks the chamber and flags the bore so instructors, range officers, and training partners can instantly verify a firearm is unloaded. Built for everyday range use and classes, the M-1 adds a clear visual and physical barrier between live ammunition and the chamber—reducing handling errors and helping you meet common range-safety requirements.
Why the CBD M-1 belongs in every range bag
Instant visual confirmation: Bright, high-contrast flag makes it easy to confirm the action is open and the chamber is empty—across the firing line or from the next bay over.
Physical chamber block: Rigid insert prevents a round from being chambered while the device is installed, adding a second layer of safety.
Tool-free install & removal: Drops in and pulls out in seconds—perfect for cold range procedures, cease-fires, and bench transport.
Range-friendly design: Smooth edges protect feed ramps and chambers; flexible flag withstands repeated use and bag carry.
Training & competition ready: Helps meet common safety practices at classes, club matches, and public ranges that require an open-bolt indicator or chamber flag.
Universal utility: Useful for instruction, storage, travel to the range, or whenever you need an unmistakable “safe” condition.
Tip: Keep a CBD M-1 in each case so every firearm you bring to the range can be flagged the moment it comes out of the vehicle.
How to use (quick guide)
Unload and clear: Remove the magazine (if applicable) and lock the action open. Visually and physically check the chamber and magazine well.
Insert the CBD M-1: Slide the chamber block into the empty chamber or ejection port until seated; ensure the flag remains clearly visible.
Verify: Confirm the action remains open and the device is fully seated.
Remove to shoot: When the line goes hot, pull the flag straight out, stow it, and confirm normal function before loading.
When to use it
Cease-fires and target changes: Leave the M-1 installed so RSOs can verify a cold line instantly.
Classes and qualifications: Standardize safety checks for large groups of new shooters.
Transport on the range: Move firearms between benches or bays with an unmistakable safe indicator.
Storage: Add a visible reminder that the chamber is empty (always follow full safe-storage practices).
Benefits you’ll notice
Faster safety checks: Less time spent repeating “show clear” and more time training.
Confidence for new shooters: A clear “safe” signal reduces anxiety during first-time handling.
Professional habits: Adopting a chamber flag builds consistent, range-approved procedures.
Care & maintenance
Wipe with a dry or slightly damp cloth after dusty range sessions.
Inspect for deformation; replace if the flag or insert is damaged or excessively worn.
Store away from sharp objects to keep edges smooth.
Frequently asked questions
Q: What firearms does the CBD M-1 fit?
A: The M-1 is designed as a universal-style chamber flag that works with most common actions when inserted through the ejection port into the chamber area. Always verify proper seating and visibility on your specific platform.
Q: Will it scratch my chamber or feed ramp?
A: The device uses smooth, non-marring surfaces and rounded edges. Insert and remove straight to avoid unnecessary contact with precision edges.
Q: Is it required at competitions?
A: Many clubs and sanctioning bodies require chamber flags or open-bolt indicators. The M-1 helps satisfy typical range-safety practices—always check your event’s official rules.
Q: Can I close the action on the flag?
A: Follow your range’s protocol. Most procedures require the action remain open with the flag visible.
At-a-Glance Specs
Product: Chamber Blocking Device
Model: CBD M-1
Function: Visual and physical chamber block with safety flag
Installation: Tool-free, drop-in through ejection port
Use Cases: Range safety, instruction, competition, storage reminder
Color: High-visibility flag (varies by batch)
Safety note: A chamber block is an additional safety aid—it does not replace the rules of safe firearm handling. Always keep firearms pointed in a safe direction, keep your finger off the trigger until ready to fire, and confirm unloaded status before inserting or removing the device.
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Choose the Chamber Blocking Device – CBD M-1 to make safe status unmistakable—on any bench, any bay, any day. The End
