SRS / TAC-41 Piston Cup with air brake V2

Airbrake reduces the impact noise generated by the piston hitting the cylinder head by creating an air cushion just before contact. This system can significantly reduce the overall firing sound of a bolt-action airsoft replica, with minimal or no loss in muzzle energy (when properly tuned).

This new version of the airbrake kit replaces the previous three-piece aluminum set with seven finely graduated airbrakes. These are injection-molded from reinforced polycarbonate – a high-performance engineering plastic known for its durability, resilience, and precision. The polycarbonate construction ensures no compromise in strength, reliability, or performance compared to the former aluminum design.

Seven airbrakes (sizes XXS, XS, S, M, L, XL, XXL) come attached to a single sprue, allowing users to easily select and detach the size that best suits their goals. Sizes XXS, M, and XXL correspond to the previous aluminum models, while the four additional sizes allow for much finer adjustment of the damping effect. This lets players optimize noise reduction without sacrificing power.

How to choose the right airbrake

Test your replica with a chronograph using each of the 7 airbrakes. You should get a curve that starts with a stable plateau before dropping off sharply, as shown in the example (see chart below). Choose the longest variant that does not reduce the replica's power.

Compatibility

• Original SRS piston (SBA-BPS-12 [discontinued] and SBA-BPS-13)
• Original TAC-41 piston (SBA-BPS-30)
• Variable mass piston for SRS (SBA-BPS-18)
• Variable mass piston for TAC-41 (SBA-BPS-31)
• SRS Push piston (SBA-BPS-14, discontinued)
• SRS Push bolt kit (SBA-BBA-17, discontinued)

Not compatible with

• TAC-41 GBB hop-up unit and cylinder head (SBA-HOP-31 and SBA-CYL-33)
• Early SRS A1 pistons (SBA-BPS-02, SBA-BPS-03, SBA-BPS-04 – all discontinued)