The Kaw Valley Precision Gen 2 Suppressor Piston in M13.5×1 LH (brand part no. KVPPISTON1805) is a replacement fast-attach piston that threads onto a 13.5×1 left-hand muzzle to give a compatible fast-attach suppressor a secure mounting point. Kaw Valley Precision’s Gen 2 piston design improves on earlier generations with tighter tolerances for a more consistent point of impact when removing and reinstalling a suppressor. This piston is a mounting accessory sold separately from the suppressor itself — it is not a regulated NFA item on its own, and purchasing a replacement or spare piston involves no ATF transfer paperwork; the suppressor it attaches to remains the actual Title II item requiring an approved transfer.

Key Specifications

• Threads onto a M13.5×1 left-hand muzzle.
• Built as a Gen 2 fast-attach piston for improved point-of-impact consistency.
• Sold as a replacement or spare mounting piston, separate from the suppressor body.
• Sold as a replacement or spare piston, separate from the suppressor.
• Threads directly onto the host’s factory muzzle threading.

Frequently Asked Questions

Do I need an ATF Form 4 to buy this piston? No, this piston is a mounting accessory sold separately from the suppressor; buying it alone involves no NFA transfer paperwork.

Will this fit any fast-attach suppressor? It’s built to Kaw Valley Precision’s Gen 2 fast-attach piston specification; confirm your suppressor’s mounting system is compatible before ordering.

Buy the Kaw Valley Precision Gen 2 Suppressor Piston, M13.5×1 LH

Keep a spare mounting piston on hand with this Kaw Valley Precision part from our Class 3 parts and accessories lineup. Order it from our Lubbock, Texas gun shop for fast, direct shipping to your door.