CW/CCW

CW and CCW are thread direction markings commonly used on barrels and muzzle devices for firearms and airsoft replicas. CW (ClockWise) – a right-hand thread that tightens clockwise. CCW (Counter-ClockWise) – a left-hand thread that tightens counter-clockwise. The rule is simple: the tightening direction matches the thread's rotation direction. Most conventional screws use a right-hand – CW thread because it offers better stability under load. The CW / CCW marking therefore indicates the tightening direction. Most real firearms use right-hand CW threads, while airsoft most often uses a 14mm CCW left-hand thread to prevent loosening. Some platforms such as AK, EVO, MK23, SRS, or M14 use non-standard threads and require adapters or specific muzzle devices. Thread adapters can be found on our e-shop.

Why do left-hand threads exist?

On flash hiders, compensators, or suppressors, recoil forces can cause thread loosening. Therefore CCW threads are used, which tighten themselves under recoil. In airsoft, CCW threads have become the standard.

The most common firearm and airsoft barrel threads

Real firearms – predominantly right-hand CW threads.
Airsoft replicas – most commonly the left-hand 14mm CCW thread.

In airsoft, the CCW thread has become the practical standard for barrels and suppressors, as it reduces the risk of loosening.

Atypical threads on firearms and airsoft platforms

Some firearms and replicas use non-standard dimensions and thread directions:

AK platforms – commonly a 24mm thread on the gas block (often CW).
CZ Scorpion EVO 3 – specific 18mm thread.
M14 – thread types vary depending on manufacturer.
MK23 SOCOM – 16mm CW thread (for suppressor mounting).
SRS Silverback – several thread versions depending on barrel generation.

Therefore some models require a thread adapter when mounting standard suppressors or muzzle devices.

Thread adapter installed on an AK