SilencerCo Piston AC1346 | .578 x 28 XL | 45 ACP

The SilencerCo Piston AC1346 is a purpose-built piston component for SilencerCo threaded barrels and compatible silencer mounts. Constructed from heat-treated 17-4 stainless steel, it is intended to provide durable, serviceable function as part of the Nielson device that enables semi-automatic cycling and barrel unlocking. The piston uses female threading to attach to SilencerCo threaded barrels and is offered in an XL size and .578 x 28 XL thread pattern for compatible hosts. Common applications include range training and competitive shooting where a reliable, removable piston interface is required.

Product Specifications

• The manufacturer is SilencerCo.
• The model is Piston with manufacturer part number AC1346.
• The material is 17-4 stainless steel, heat-treated for enhanced durability.
• The thread pattern is .578 x 28 XL.
• The NFA thread pattern is listed as .578×28.
• The part is offered in size XL.
• The piston attaches via female threading to SilencerCo threaded barrels.
• The piston is part of the Nielson device that allows semi-automatic cycling and unlocking of pistol barrels.
• Compatible models include Omega K Series; Hybrid 46; Hybrid 46M with Charlie Piston Mount; Osprey Series; Octane Series; Omega 36M with Charlie Piston Mount.
• The product type is Accessory-Silencer Accessories.
• The UPC is 817272015287.

Built from heat-treated 17-4 stainless steel and designed for straightforward installation on compatible SilencerCo hosts, the AC1346 piston provides a durable, serviceable interface for suppressed semi-automatic pistols used in range training and competition. Its replaceable design and common compatibility with SilencerCo mounts make it practical for users who need a reliable piston solution without modifying the host firearm.