Action Army AAP-01 Assassin - Screw Hop-Up Part 5 (Ref 5) - Hop Chamber Side Fixing Screw M2.5 Steel

AAP-01 Part 5 hop-up screw - GBB part

Part 5 (Ref 5) of the AAP-01 Action Army is the Hop Chamber Side Fixing Screw in the manufacturer's official nomenclature. It anchors and aligns the hop-up chamber inside the upper receiver of the GBB pistol. Manufacturer reference : AAP_05.

Technical specifications of AAP-01 Part 5 screw

• Official designation: Hop Chamber Side Fixing Screw
• Manufacturer reference: Part 5 / Ref 5 / AAP_05
• Screw type: Micrometric - precise threading for play-free tightening
• Dimensions: M2.5
• Material: Steel - superior resistance to plastic and zamak
• Color: Black
• Packaging: Sold individually (1 piece)
• Declared compatibility: Action Army AAP-01 Assassin

Advantages of the AAP-01 steel hop-up screw

Three technical reasons to choose the Action Army original part.

• Full-mass steel body: unlike zamak or low-end alloy screws, this screw withstands repeated tightening during maintenance cycles. It won't warp or tear, and keeps its threads intact over time.
• Micrometric M2.5 thread: the precise thread pitch guarantees tight, play-free tightening in the hop-up block housing. A mismatched thread causes the chamber to shift in the upper receiver - and a deviated trajectory immediately perceptible when fired.
• Original Action Army part: dimensions, head profile and length are identical to factory specifications. No modifications or adjustments are required for installation. Zero risk of geometric incompatibility.

Installing the Part 5 screw in the AAP-01

• Difficulty: Intermediate - partial disassembly of hop-up chamber required
• Tools required: Adapted M2.5 screwdriver (micro head)
• Prerequisites: Disassembly of AAP-01 upper receiver
• Help resource: Official Action Army AAP-01 exploded diagram available online (Part 5 nomenclature)

GBB replicas compatible with Part 5

• Action Army AAP-01 Assassin (GBB 6mm airsoft pistol)

Why choose the original Part 5

• Certified original part: perfect compatibility guaranteed
• Resistant steel: withstands repeated disassembly cycles
• Precise M2.5 format: clean tightening, solidly secured hop-up
• Sold individually: order several, store them in your workshop

Get your AAP-01 back in shooting condition right away - add Part 5 to your basket.

Technician's opinion on the AAP-01 hop-up screw

This is the screw that every technician loses at least once when disassembling his AAP-01 - and then looks for everywhere. The original Action Army version is the only one that guarantees correct positioning of the hop-up chamber in the upper receiver: don't replace it with an off-the-shelf M2.5 without checking the exact length, otherwise you'll end up with a shifted hop-up and an unstable trajectory. In the store, we always recommend taking two or three at a time.