SilencerCo AC728 Piston Kit | Osprey/Octane | 5-Piece

This is a five-piece piston kit from SilencerCo designed for use with the Osprey and Octane suppressors. The kit groups common piston sizes and includes three O-ring packs for field interchangeability and basic service. Components are made of stainless steel and receive a black nitride finish for wear resistance and lubricity.

Useful for maintaining host compatibility across a range of pistols and calibers, the kit supports quick piston changes for semi-automatic pistols that use a Nielsen device-style piston. Typical applications include suppressor-equipped range use and caliber or host-change setups where frequently swapping host pistons is needed.

Product Specifications

• The manufacturer is SilencerCo.
• The model is listed as Osprey/Octane.
• The part number is AC728.
• The kit is a 5-piece piston set.
• The kit includes pistons sized .578×28, 1/2×28, 16mm x 1 LH, 13.5mm x 1 LH, and 9/16×24.
• The kit includes O-ring packs: Booster Assembly O-Ring Pack, M13 O-Ring Pack, and M16 O-Ring Pack.
• The material is specified as 17-4 stainless steel.
• The finish is Black Nitride.
• The product type is a Piston Kit designed for suppressor host compatibility.
• The kit is intended to fit the Osprey and Octane suppressors by SilencerCo.
• The listed caliber/gauge association is .45 ACP (as provided in product attributes).
• The series/name is Piston Kit.
• The UPC is 817272015294.

This piston kit provides a practical way to adapt SilencerCo Osprey and Octane suppressors to multiple host thread patterns by swapping pistons and replacing O-rings as needed. Its stainless construction and nitride finish focus on durability and serviceability rather than decorative features.