Grimtron Portable Car Gun Safe Review: Cheap Lockbox, Worth It?
The Grimtron Portable Car Gun Safe is a thin, cable-equipped steel lockbox with a backlit keypad, backup keys and a USB-C emergency power port. It fits someone who needs basic, inexpensive locked storage for one compact handgun in a vehicle, a drawer, a dorm room or a hotel stay. It is a poor choice if you want fingerprint access, a heavy-duty vault, or a tested fire or pry rating.
Bottom line:
- Best for: a low-cost, slim, cable-secured box for a vehicle seat frame, luggage or a drawer, listed in the under $50 range at the time of writing.
- Trade-off: it is a light portable box with a keypad, not a hardened safe, and batteries are not included.
- Before buying: measure your handgun against the box and check the current price on Amazon.
This review is based on the Amazon listing, the seller bullets and the spec table. We have not handled the box, and the data we reviewed has no summary of owner feedback, so we do not guess at what buyers say. Where the page is silent we say what to check. For other budget picks, our guide to the best gun safes under $100 and the main best gun safes page give context.
Grimtron specs at a glance
| Spec | Listing detail |
|---|---|
| Dimensions | 11.02″ D x 7″ W x 1.85″ H |
| Weight | 3.7 pounds |
| Capacity | 0.06 cubic feet (roughly 100 cubic inches) |
| Lock type | Backlit keypad (3 to 8 digit code) and key |
| Material | Alloy steel |
| Emergency power | USB-C port (does not recharge the batteries) |
| Batteries | 4 AAA, not included |
| In the box | Safe, security cable, USB-C cable, key, mounting hardware |
Access and lock
The Grimtron uses a keypad rather than a fingerprint reader. The seller says you set your own code of 3 to 8 digits, which is a wider range than the usual four-digit limit on many boxes. Longer codes are harder to guess, so a six- to eight-digit number that is not a birthday or address is a sensible choice, especially if children live in the house or the box rides in a car where others may see you tap it.
The keypad is backlit, which helps in a dim vehicle footwell or a bedroom at night. Silent mode is listed as a feature, so you can mute key beeps when you do not want to attract attention or wake a roommate. Check the manual for whether wrong-code behavior or low-battery alerts are affected when the sound is off.
The backup is a physical key. Backup keys are included, and the listing mentions them in plural. Keys bypass the electronics, so they are your answer to a dead battery or a keypad fault. The practical trick is storage: the key should not live in the same glove box, bag or drawer as the safe, or the lock becomes a formality.
Watch: Ready Set Gear posted a review video of this safe, which shows the keypad and the cable in use.
Build and security features
The spec sheet lists alloy steel, and the seller calls the design compact and durable. No steel gauge, bolt design or pry rating appears in the data, so we cannot rank it against heavier boxes that publish those figures. At 3.7 pounds, it is built to be carried, which is exactly what makes the cable and the mounting holes important. A light box that is not tied to anything can be removed in seconds.
The security cable is the main anti-theft feature. The seller says to run it around a vehicle seat frame, luggage rack or other fixed object. That works best when you pick something genuinely structural, and when you take up the slack so the box cannot be swung out. The listing also mentions pre-drilled holes for a fixed installation, which gives you a more permanent option in a drawer, shelf or cabinet.
The description adds that the interior is padded to protect contents from scratches. It also talks about keeping firearms away from children, even in a car. Treat the product as a lockable container that helps prevent casual access, rather than a rated child-resistance device; nothing in the data shows a formal rating. Laws on storage, child access and carrying firearms in vehicles vary by state, so check yours before you travel.
Interior and fit
The outside is 11.02 inches deep, 7 inches wide and 1.85 inches tall, and the capacity is listed as 0.06 cubic feet. With wall thickness and padding to subtract, the usable height is small. That strongly suggests a compact or mid-size handgun lying flat, without a tall optic or an extended magazine. The listing does not publish interior dimensions or a maximum handgun length, so measure your handgun’s length, height and width, including any attachments, and ask the seller if the page does not say.
Think of the 1.85-inch exterior height as a hard filter. If your handgun is wider than that once you add a light or optic, it will not close. A full-size frame might fit in length but fail on thickness. The padded lining can also shave a few millimeters, so leave some margin.
Extras such as a spare magazine, a card or a small item may fit alongside a compact handgun, but only if the space allows. The seller describes the box as suitable for valuables too, but we would not plan on storing much else.
Mounting and placement
This is a flexible, low-profile box. The seller lists a vehicle seat, luggage, a drawer, a bedside, a dorm and a hotel room as places it can sit. The cable handles temporary or travel situations, and the pre-drilled holes with included hardware handle permanent ones. For a permanent mount, screw into solid wood or a structural member, not thin particleboard.
In a vehicle, placement is as much about legality and heat as convenience. Many people avoid leaving a box in direct sun, since interior temperatures in a parked car climb quickly and can be hard on batteries. Rules about storing and transporting firearms in vehicles vary by state, so check yours. Our guides can only cover storage, not legal advice.
Power and batteries
The keypad runs on four AAA batteries, which are not included. That is a small extra cost, and an easy one to forget. If the batteries die, the listing offers two fallbacks: the backup keys, and a USB-C port that accepts a power bank or a vehicle power source to temporarily power the keypad. A USB-C cable is in the box. The seller is clear that the port is for emergency power only and does not recharge the batteries, so you will still need to swap cells afterward.
Plan on replacing batteries on a schedule instead of waiting for a warning, and keep a spare set somewhere other than the safe. If the box lives in a hot or cold car, check the manual for operating limits. Listing data does not give a battery life estimate.
What owners say
No owner feedback summary was available for this listing, so we will not pretend to know the common themes. It is moderately reviewed on Amazon, which means there is something to read. When you do, look at recent comments for the keypad’s feel and responsiveness, how well the cable and mounting holes work, whether the interior fit matches the description, and how the box holds up to being moved. A single complaint is just that; repeated ones about the same point are worth more.
Pros and cons
Pros
- Slim 1.85-inch body fits under a seat, in a drawer or in luggage.
- Backlit keypad with a 3 to 8 digit code and silent mode.
- Backup keys plus USB-C emergency power.
- Security cable and USB-C cable included.
- Pre-drilled holes for fixed mounting.
- Listed in the under $50 range at the time of writing.
Cons
- Small interior, likely limited to a compact handgun.
- Four AAA batteries are not included.
- No fingerprint access and no stated steel gauge or pry rating.
- USB-C port does not recharge the batteries.
How it compares
The BILLCONCH Biometric Handgun Safe is in a similar slim, portable format but adds fingerprint, app and key access and a published interior size, in the under $100 range. If you want fingerprint speed, it is the more feature-rich option.
The ONNAIS Iron Pro also offers a fingerprint reader and keypad with a backup key and emergency USB-C power, in a wall-mount form. The RPNB RP311F is a vertical, mount-it-anywhere model with fingerprint, code and key.
The Hornady RAPiD Safe Night Guard is a heavier RFID nightstand safe with a clock, USB ports and a steel lock-down cable, in a variable price band. It is a different class of product, aimed at fixed bedside use. For more budget picks, see the best gun safes under $100 and browse the gun safe reviews A to Z.
Price and deals
At the time of writing, the Grimtron Portable Car Gun Safe sat in the under $50 range. Prices on Amazon move, so check the current price before buying. Our Grimtron Portable Car Gun Safe promo code page explains clip coupons and sale seasons without promising any code. You can check today’s price on Amazon.
Final verdict
The Grimtron is a sensible budget pick when you want a simple lockable box with a cable for travel or a drawer. It gives you a backlit keypad, backup keys, silent mode and a USB-C lifeline, but it is not a fingerprint box and it leaves the toughness questions unanswered. Measure your handgun, buy batteries and check the current price when you view it on Amazon.
Grimtron Portable Car Gun Safe FAQ
What handgun fits the Grimtron Portable Car Gun Safe?
The outside is 11.02 by 7 by 1.85 inches with a listed capacity of 0.06 cubic feet. Interior measurements are not published, so expect room for a compact handgun lying flat. Measure length, height and width, including any light or optic.
What batteries does the Grimtron use?
The keypad takes four AAA batteries, which are not included. If they die, you can use the backup keys or connect a power bank or vehicle power source to the USB-C port. The port is for emergency power only and does not recharge the batteries.
How do I secure the Grimtron in a car?
The seller says to run the included steel cable around a vehicle seat frame, luggage rack or other fixed object. Pre-drilled holes allow fixed mounting with the included hardware. Firearm transport and storage rules vary by state, so check yours.
Is there a fingerprint option on the Grimtron?
No. Access is by a 3 to 8 digit keypad code or the backup keys. If you want a fingerprint reader, look at the biometric models in our comparison section, such as the BILLCONCH or ONNAIS.
Can I silence the keypad on the Grimtron?
Yes, the listing includes a silent mode for quiet keypad operation. Check the manual to see whether any alert sounds when the batteries run low while silent mode is on.
Concealed Handgun Carry is reader-supported: as an Amazon Associate we earn from qualifying purchases, at no extra cost to you. We research listings, manuals and owner feedback; we do not accept payment for placement. Prices, coupons and availability change, so check Amazon for the current details. Store firearms safely and follow your state’s storage laws.
