When you upgrade a gas blowback pistol with a metal slide, the original gas management and sealing performance can quickly become the weak link. Stock piston heads and standard O-rings often struggle with friction and improper air-sealing, which can lead to sluggish cycling, weaker felt recoil, and wasted gas. The PTS MEC V Piston Head Set (6pcs/ Black & Purple) is designed to address these exact issues inside the GBB pistol nozzle.

Made from durable oil-resistant rubber, each piston head uses a unique V-shape ramp cut at the base of its inner wall. When high-pressure gas enters the nozzle, the V-shaped channel directs that pressure outward, instantly pushing the outer sealing edge against the nozzle wall. Because the seal responds quickly and with less friction, the result is a noticeably sharper felt recoil, crisper cycling, and improved overall gas efficiency. Instead of losing pressure through leaks, the nozzle is able to use the gas more effectively shot after shot.

The set is sold as a comprehensive six-piece value pack and is available in two nozzle diameter ranges: 13.40?13.80 mm and 14.20?14.80 mm. Each kit contains three distinct incremental sizes, and each size is supplied in two rubber hardness options. This allows airsoft gunsmiths and advanced users to fine-tune gas pressure handling and weather compatibility rather than relying on a single compromise fit.

Key performance features are built into the design. The V-shape ramp cut sealing system uses expanding air pressure to create a rapid, low-friction air seal. That superior air-tightness helps eliminate pressure leaks, delivering crisp cycle speed, stronger felt blowback, and lower gas consumption per shot. The specialized rubber is also engineered for high-impact durability, so it can withstand repeated cycling and elevated gas pressures. Dual hardness options are included: Black (60?) is intended for colder weather or standard-power green gas, while Purple (70?) is intended for warmer weather or high-power gas. The micro-sized fitment strategy, with three micro-step sizes and two hardness levels per size, helps ensure a precise fit across different manufacturing tolerances.

Technically, the product is branded by MEC and named the MEC V Piston Head Set (6pack). The item codes are ME213450300 for the 13.4?13.8 mm set and ME113450300 for the 14.2?14.8 mm set. It is made from high-grade rubber, and the total pack weight is 8 g including packaging. Each package contains six pieces in total, made up of three sizes and two hardness variations. The 13.40?13.80 mm set is suitable for GBB pistol nozzles approximately 13 mm to 14 mm in diameter, while the 14.20?14.80 mm set is suitable for nozzles approximately 14 mm to 15 mm in diameter. In terms of hardness, Black (60 Degree) is for colder weather or regular-power green gas, and Purple (70 Degree) is for warmer weather or high-power gas.

The MEC V Piston Head Set is intended for airsoft gunsmithing, GBB pistol tuning, and maintenance. It is especially ideal for shooters running aftermarket metal slides or for anyone seeking maximum gas efficiency and recoil impulse across fluctuating field temperatures. By combining responsive sealing, durable materials, and fine-tuneable sizing, it offers a practical upgrade for making a GBB pistol feel sharper, more consistent, and more gas-efficient.

Key Feature

• MEC V Piston Head Set (6pcs/ Black & Purple) is a six-piece piston head upgrade for GBB pistols, ideal for airsoft gunsmithing, tuning, and maintenance.

• It solves friction and air-sealing problems caused by metal slide upgrades, stock piston heads, or standard O-rings?issues that lead to sluggish cycling, weak recoil, and wasted gas.

• Each piston head is made of durable oil-resistant rubber with a unique V-shape ramp cut at the base of the inner wall.

• High-pressure gas enters the V-channel, pushing the outer sealing edge outward against the nozzle wall for a fast, low-friction air seal.

• Result: sharper felt recoil, crisper cycling, stronger blowback, better gas efficiency, and less gas used per shot.

• The V-shape sealing design uses expanding air pressure for rapid air-tightness and eliminates pressure leaks.

• Specialized rubber provides high impact durability for repeated cycles and elevated gas pressures.

• Sold as a 6-piece value pack in two nozzle diameter ranges: 13.40?13.80 mm and 14.20?14.80 mm.

• Each kit has 3 incremental sizes, each with 2 hardness options, allowing fine-tuning for gas pressure and weather.

• Hardness options: Black (60?) for cold weather or standard green gas; Purple (70?) for warm weather or high-power gas.

• Brand: MEC. Product: MEC V Piston Head Set (6pack).

• SKUs: ME213450300 (13.4?13.8mm); ME113450300 (14.2?14.8mm).

• Material: high-grade rubber. Pack weight: 8g including packaging. Contents: 6 pieces (3 sizes ? 2 hardness).

• 13.40?13.80mm set fits GBB pistol nozzles approx. 13?14mm diameter.

• 14.20?14.80mm set fits GBB pistol nozzles approx. 14?15mm diameter.

• Ideal for aftermarket metal slides, GBB tuning, and maximum gas efficiency/recoil across changing field temperatures.