$3,300.00

SIG Sauer Rattler 5.5in, 5.56 NATO — Custom PDW Build

Price Negotiable?: Yes
Phone Number: Click to view
Condition: Like New
Listing Type: Individual
City: sandy
State: Utah
Zip/Postal Code: 84092
Local County (e.g., Summit County): salt lake
Make/Brand: Sig Sauer
Model: Rattler
Caliber: 5.56
Terms: Must agree to terms
Listed: October 19, 2026 5:04 pm
Expires: 56 days, 13 hours

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Listing Type: Individual

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Description

SIG Sauer 5.5’’ barrel Rattler 5.56 NATO — Custom PDW Build

Asking Price: $3,300

Condition: Like New — Test Fired Only Following Build for Function Testing

Caliber: 5.56 NATO
Barrel Length: 5.5 inches
Platform: SIG Sauer MCX Rattler
Configuration: Custom PDW Build
Round Count: Fewer than 50 rounds fired

Firearm Description

SIG Sauer Rattler chambered in 5.56 NATO, featuring a compact 5.5-inch barrel Custom build.

Condition is like new. The firearm has been test-fired only following completion of the custom build for function testing, with fewer than 50 rounds fired. It has been carefully maintained and shows minimal signs of handling or use.

A notable part of this configuration is the custom BSD Fabworkx muzzle adapter, which allows the installation of a threaded muzzle device. And accommodates the installed Dead Air Xeno three-prong flash hider.

Custom Components and Accessories

EOTech XPS2 Green: Holographic weapon sight
SIG Sauer: Side-folding stabilizing brace
BSDFabworkx: Custom muzzle adapter — $200 original cost
Dead Air Xeno: 1/2×28 three-prong suppressor-compatible flash hider
Weapon-Mounted Light
Remote Pressure Switch: Light activation system
ANNEX Defense: Aftermarket flared speed magwell
Forward Hand Stop: Textured aftermarket component
Magpul MBUS 3: Front and rear folding backup iron sights
Concealment Bag: Black padded carrying bag with shoulder strap and storage compartments — $130 original cost