SILENCERCO AC24 OSPREY/OCTANE PISTON .578X28 45 ACP

The SilencerCo AC24 Piston (.578x28) is the professional-grade mounting solution required to run your SilencerCo suppressor on most .45 ACP handguns. Precision-engineered to serve as the heart of your suppressor’s booster assembly, this piston ensures your semi-auto pistol cycles reliably every time you pull the trigger.

Reliable Semi-Auto Cycling

Most .45 ACP handguns (like the 1911, HK45, or Sig P220) use a tilting-barrel action. The AC24 piston acts as the moving component of the Nielsen device (booster), allowing the barrel to recoil independently of the suppressor's weight. This prevents "short-cycling" and ensures smooth feeding and extraction.

Rugged, Duty-Ready Build

• 17-4 Stainless Steel: Built from high-strength, aerospace-grade stainless steel to handle the high pressures of .45 ACP.
• Heat-Treated Finish: Specially treated for maximum hardness, ensuring the threads and engagement teeth won't wear down even after thousands of rounds.
• Precision Threading: Cut to a perfect .578x28 thread pitch, the industry standard for threaded .45 ACP barrels.

Universal SilencerCo Compatibility

The AC24 is a versatile "workhorse" piston that fits the entire flagship SilencerCo pistol line:

• Osprey Series (45, 45K, and 9mm models)
• Octane Series (9, 45, and 45 2.0)
• Omega K Series (9K and 45K)
• Hybrid 46 / 46M (requires piston mount)

Quick Specs

• Model: AC24
• Thread Pitch: .578x28
• Main Caliber: .45 ACP
• Material: Heat-Treated 17-4 Stainless Steel
• UPC: 817272010145

Usage Note: For maximum performance, apply a light coat of high-temp grease to the outside of the piston before installation to ensure smooth movement within the booster assembly.