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Product Image CNC Machined POM Piston Head for KSC/KWA 15mm Cylinder GBBs

CNC Machined POM Piston Head for KSC/KWA 15mm Cylinder GBBs


This CNC machined piston head is designed to replace the standard E-12 / E-16 cup-seal in KSC & KWA gas blow back pistols and SMGs with a 15mm cylinder in the loading nozzle. A high quality O-ring on a precisely machined POM body is used to provide a better and more reliable seal than worn or poor fitting cup-seals which can increase gas efficiency and in some cases fps.

Each piston head is machined from Acetal (POM), a lightweight and durable plastic to a tight tolerance and includes 3 spare O-rings (4 in total) ready for future replacement and a stainless steel Torx screw.

Compatible with the following KSC S7 & KWA NS2 GBBs

USP, USP Compact, P226r, M226, M11A1, Cz75, Kz.75, MP7

Caution – KSC & KWA GBBs normally have threadlocker applied to the screws in the blow back unit, care should be taken when removing them for the first time to avoid rounding off screw heads, a small amount of silicone oil or grease should be applied to the O-ring during installation.
UK Shipping Prices

Royal Mail First Class - £1.80, free for orders over £30.00
Royal Mail First Class Signed For - £2.70 flat rate

International Shipping Prices

Royal Mail Standard Airmail - £3.00
Royal Mail Standard Airmail – Free for orders over £30.00
Royal Mail Priority Tracked & Signed For Airmail – Starts at £9.00


Lees Precision Engineering does not ship to the following countries,
China, Indonesia, Peru

Dispatch & Delivery Times

Orders are normally dispatched within 3 working days of receiving payment.

Orders within the United Kingdom generally arrive within 1 – 2 working days of being dispatched however may take upto 10 working days, especially during peak times for Royal Mail.

International orders generally arrive within 3 – 10 working days of being dispatched but may take upto 15 working days.

International orders to Canada and South American countries often take slightly longer and may take upto 20 working days to arrive from the date of dispatch.