Gardner Bender MSG-501B Cable Boss Staple Gun - Professional Grade

In this review of the Gardner Bender MSG-501B Cable Boss Staple Gun the bottom line is clear: this tool is designed for electricians and installers who need a reliable, purpose-built stapler for NM, coax and low-voltage cable. The tester found its patented design and staple guide deliver consistent insertion without nicking insulation, which is the single biggest reason a pro would choose it over improvised stapling methods. It is a focused, heavy-duty tool built to pair with Cable Boss staples for faster routing and safer cable runs.

Key Features

• Patented compatibility: Works specifically with GB mps-2080, mps-2100 and mps-2125 staples so installers get correct fit and holding strength without guessing staple sizes.
• Comfortable grip: An ergonomic handle and front grip area let one-handed or two-handed operation reduce fatigue during long runs.
• Heavy-duty construction: Built to survive a 10 ft. drop, which speaks to jobsite durability and long service life.
• Rear cable guide: The built-in rear guide reduces cable twisting and keeps wire aligned for clean, repeatable placements.
• Staple insertion reliability: The staple guide helps ensure full insertion into wood while protecting cable insulation from damage.

Who It's For

The MSG-501B is best for professional electricians, low-voltage installers, and serious DIYers who regularly secure NM, coax, and other low-voltage cable and want a tool that speeds installs and protects cable insulation. It is especially useful on jobs where repeated, consistent stapling is needed and when paired with the matching Cable Boss staples.

Those who should look elsewhere include users who need a multi-purpose heavy gauge stapler for framing or general construction fasteners; this gun is tailored to cable staples and designed to be used with the specified Cable Boss staple family rather than generic staples.

Pros & Cons

Pros

• Durable build that survives jobsite drops and stands up to regular use.
• Design that protects cable insulation while ensuring full staple insertion.
• Comfortable ergonomic handle and front grip that reduce operator fatigue.
• Rear guide improves cable control and reduces twisting during installation.

Cons

• Requires the specially designed Cable Boss staples for proper use, so users must stock the correct staples.
• Some users report variable ease-of-use and occasional jamming depending on staple choice and technique.

Specifications

Product name	MSG-501B Cable Boss Staple Gun
Compatible staples	mps-2080 5/16 in, mps-2100 3/8 in, mps-2125 1/2 in Cable Boss staples
Primary use	Secures NM, coax, and low-voltage cable
Handle	Comfort and ergonomic design with front grip area
Durability	Survives 10 ft. drop
Cable control	Rear guide reduces cable twisting

Our Verdict

The Gardner Bender MSG-501B is a purpose-built cable stapler that offers consistent, safe cable fastening when used with the specified Cable Boss staples. Pros who need dependable insertion, jobsite durability, and better cable control will find it good value; casual users should be aware they must buy compatible staples and may encounter a learning curve for smooth operation.

Frequently Asked Questions

Does this gun work with standard staples?
It is designed to work with the specially designed Cable Boss staples listed by the manufacturer for correct fit and function.

Will it damage cable insulation?
The staple guide is engineered to ensure full insertion without nicking insulation when used properly and with the correct staples.

Is it durable for jobsite use?
Yes; the tool is built to heavy-duty standards and is rated to survive a 10 ft. drop, indicating solid on-site durability.