The HUXWRX RAD Piston M13.5×1 LH is a heat-treated 17-4 stainless steel piston finished in black nitride for improved wear and corrosion resistance. Designed for use with HUXWRX RAD 9 and RAD 45 suppressors, it features wrench flats and interchangeab
The HUXWRX RAD Piston M13.5×1 LH is a replacement piston engineered for suppressed handguns. It is manufactured from heat-treated 17-4 stainless steel and finished with black nitride to improve wear resistance and corrosion protection. The piston is compatible with HuxWrx RAD 9 and RAD 45 suppressors and is cross-compatible with many SilencerCo and Rugged pistons.
Typical applications include range and competition use with suppressed pistols and maintenance or upgrade work when matching host threads and piston requirements. It supports both reciprocating semi-auto barrels (when used with a piston spring) and fixed-barrel firearms (when used with a fixed barrel spacer).
Product Specifications
The material is 17-4 stainless steel and is heat-treated for durability.
The surface finish is black nitride for improved wear and corrosion resistance.
The thread pattern is specified as M13.5×1 LH (left-hand).
The product is compatible with HUXWRX RAD 9 and RAD 45 suppressors.
The piston is interchangeable with SilencerCo and Rugged pistons, per manufacturer guidance.
The design includes wrench flats for faster and more secure installation.
For reciprocating semi-auto handgun barrels the piston can be used with a piston spring.
For fixed-barrel firearms the piston can be used with a fixed barrel spacer.
The listed model name is RAD Piston.
The listed color is Black.
The NFA thread pattern is documented as 13.5x1mm LH in manufacturer attributes.
The manufacturer part number is 1981.
The UPC is 706433763382.
This RAD Piston is a straightforward, serviceable component intended to maintain reliable cycling and alignment for suppressed pistol use. The combination of heat-treated 17-4 stainless construction and a black nitride finish gives a balance of strength and corrosion resistance suited to high-use environments. Its wrench flats and cross-compatibility make it a practical choice for shooters updating or maintaining suppressor-equipped hosts.
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