AA AAP01 Knocker Lock (Part 45)

Action Army AAP-01 GBB Knocker Lock – part no. 45

This expert product description was prepared by the ANAREUS.cz expert team. All rights to this unique content are bound to the anareus.cz domain.The Action Army AAP-01 Knocker Lock is an original replacement component of the Hammer Housing assembly. In the exploded parts diagram, it is listed as part no. 45 under catalogue designation AAP01-09-45 and is referred as the Knocker Lock, Firing Pin Lock or Reset Arm. Despite its small size, this component plays an important role in controlling gas release and ensuring correct cycling of the GBB mechanism. When the trigger is pulled, the Valve Knocker strikes the magazine release valve and part no. 45 temporarily locks it in the forward position. This keeps the valve open long enough to release the required amount of gas to fire the BB and operate the blowback mechanism. As the slide subsequently moves backwards, the lock is depressed, releasing the Valve Knocker and allowing the magazine valve to close. The entire mechanism is then ready for the next shot. A worn, deformed or broken Knocker Lock can cause blowback problems, irregular cycling or uncontrolled release of gas from the magazine. Replacement is therefore suitable both when repairing a malfunction and when restoring a heavily used AAP-01. The part is primarily designed for the Action Army AAP-01 GBB and, according to available information, is also compatible with the Tokyo Marui R-Series Model 18.

Key features of the Action Army AAP-01 Knocker Lock

Original part no. 45

Replacement component AAP01-09-45 according to the exploded parts diagram of the Action Army AAP-01 pistol.

Valve Knocker lock

During firing, the part temporarily holds the Valve Knocker in its working position, allowing the magazine to release the required amount of gas.

Reset during slide movement

As the slide moves backwards, the lock is released, the Valve Knocker returns and the magazine valve shuts off the gas flow.

Helps resolve cycling problems

A damaged Knocker Lock can be one of the causes of weak or incomplete blowback, irregular cycling or the entire gas charge being released.

Hammer mechanism replacement part

Designed for repairing or restoring the Hammer Housing assembly when the original component becomes mechanically worn.

Original Action Army replacement part

Replacement component for the AAP-01 pistol hammer mechanism.

Technical specifications

• Manufacturer: Action Army
• Type: Firing Pin Lock / Knocker Lock / Reset Arm
• Part number in exploded diagram: 45
• Catalogue designation: AAP01-09-45
• Location: Hammer assembly / Hammer Housing
• Designed for: Action Army AAP-01 GBB pistols
• Other stated compatibility: Tokyo Marui R-Series Model 18

Package contents

• 1× Action Army AAP-01 GBB Knocker Lock – part no. 45 (AAP01-09-45)

Frequently asked questions from our store

What are the symptoms of a damaged Knocker Lock?

Possible symptoms include irregular or incomplete blowback, cycling problems and uncontrolled gas release. However, the same symptoms can also be caused by other components of the trigger, hammer or gas mechanism, so we recommend correctly diagnosing the fault before replacing the part.

Why does the Knocker Lock in the AAP-01 wear out?

The component is mechanically stressed by the movement of the mechanism during every cycle. With prolonged use, the locking surface may wear, the part may deform or the component itself may become damaged. Mechanical stress may be particularly high during intensive firing and when using FULL-AUTO mode.

Can I replace part no. 45 at home?

Replacement requires disassembling the AAP-01 hammer assembly and correctly positioning the related components and springs. If you do not have experience servicing GBB pistols, we recommend having the installation carried out by an experienced airsoft technician.