Description
CowCow AAP-01 Stainless Steel Hammer Set (PU18330)
This CowCow Technology hammer set is an upgrade for the Action Army AAP-01, one of the most popular gas blowback pistols in airsoft. CowCow is well known for its range of AAP-01 parts, and this set replaces key parts of the pistol’s hammer group with precision CNC machined stainless steel components.
The hammer group takes a lot of stress with every shot, and stock parts can wear or deform over time, especially on heavily used pistols. Replacing them with stronger, precisely machined parts helps keep the pistol reliable and the trigger feeling consistent. The parts are finished with CowCow’s MAF polishing technology for much smoother operation, and their durable construction is designed to prevent warping under hard use.
Why upgrade the hammer group
The AAP-01 is a favourite base for upgraded builds, and many players fit stronger internals as they add other upgrades. A stainless steel hammer set is a sensible step for anyone who shoots their AAP-01 a lot, uses it as a main gun or wants a dependable platform to build on. The smooth polished surfaces reduce friction between moving parts, which helps the pistol cycle cleanly.
Fitting
Fitting a hammer set requires stripping the pistol’s lower frame and fire control group, so it is best suited to players who are comfortable working on gas pistols, or to an airsoft technician. Replica parts can vary slightly, so some minor fitting may be needed. Take photographs as you dismantle the pistol to help with reassembly, and test-fire it carefully after fitting.
Key features
- Upgrade hammer set for the Action Army AAP-01
- Precision CNC machined stainless steel
- MAF polishing for much smoother operation
- Durable construction prevents warping under hard use
- Replaces the hammer, sear and firing pin
- A solid foundation for upgraded AAP-01 builds
Compatibility
Designed for the Action Army AAP-01 Assassin gas blowback pistol. It may also suit AAP-01 compatible clones, but parts can vary between manufacturers, so check your pistol’s model before ordering.
Care and maintenance
When the pistol is apart, clean old grease and debris from the fire control group before fitting the new parts. Apply a light coat of suitable grease to the contact surfaces and pivot points, and avoid over-greasing, which can attract dirt. Keep gas magazine seals lubricated with silicone oil and store the pistol clean and dry.
Who is it for?
AAP-01 owners who want a stronger, smoother hammer group for reliability or as part of a full upgrade build, and who are confident working on gas pistol internals or have access to a technician.
Please note: This is a replacement part only; the pistol is not included. Fitting requires technical knowledge. Always wear suitable eye protection when testing a replica.
Please note: what's in the box can vary between batches. If a detail such as included magazines, battery, charger or connector type matters to you, contact us or call 01842 683567 and we'll confirm before you order.









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