Johnson Dynamics LLC

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Johnson Dynamics LLC Mark series upper receivers, optic cuts, skeletonized uppers & BCG's, laser engraving, 3D printing

Air Horn Perimeter Alarm DeviceAdd an audible warning system to campsites, hunting camps, property boundaries, sheds, ve...
09/29/2026

Air Horn Perimeter Alarm Device

Add an audible warning system to campsites, hunting camps, property boundaries, sheds, vehicles, equipment, and other areas with this 3D Printed Air Horn Perimeter Alarm. Designed to work with a standard 1.4 oz air horn (not included), this spring-triggered alarm gives you four different ways to activate the horn depending on how you want to use it.

The alarm uses a spring-loaded mechanism that sits beneath the air horn. It can be activated by stepping on the top of the unit or by using the included pull-pin setup. The locking screw allows you to choose between a short burst or continuous activation.

Available at johnsondynamicsllc.com, eBay, and Amazon

Introducing the .750″ Gas Block Pinning Jig, the essential tool for locking down low-profile gas blocks on .750″ barrels...
09/09/2026

Introducing the .750″ Gas Block Pinning Jig, the essential tool for locking down low-profile gas blocks on .750″ barrels.

🔸Rigid Alignment: Holds components firmly to eliminate off-center pin holes.

🔸Seamless Tapered-Pin Installs for guiding

​Two Material Options: Choose 1018 Steel or light-duty PLA depending on your workflow and budget.

Shop at ​johnsondynamicsllc.com (link in bio) or Amazon

​ GunTooling 2AEngineered

FNX-45 with optic cut, raptor cut, and cobra cut #45
05/22/2026

FNX-45 with optic cut, raptor cut, and cobra cut

#45

Chamber Flag (5-Pack) – Empty Chamber Indicator for Fi****msEnsure safety and compliance at the range with our high-visi...
04/14/2026

Chamber Flag (5-Pack) – Empty Chamber Indicator for Fi****ms

Ensure safety and compliance at the range with our high-visibility 3D Printed Chamber Flags, also known as Empty Chamber Indicators (ECIs). Sold in a convenient 5-pack, these essential safety devices clearly signal that a fi***rm is unloaded, providing peace of mind for shooters, range officers, and bystanders alike. The bright, attention-grabbing color ensures instant visibility from a distance, making it easy to confirm safe fi***rm status at a glance.

Key Features:

Includes 5 chamber flags per pack
Clearly indicates an unloaded fi***rm for enhanced safety
Durable 3D printed construction for long-lasting use
Bright color for high visibility and quick identification
Universal fit for most fi***rms
Lightweight and easy to insert/remove
Ideal for shooting ranges, training, and safe storage.

Always remove the chamber flag before charging or closing the bolt. Failure to do so may cause damage to the fi***rm or the flag.

Address

Boiling Springs, SC

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