CTM Hi-Capa HPA M4 Magazine Adapter
CTM Hi-Capa HPA M4 Magazine Adapter
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DETAILS
DETAILS
- description
The CTM Hi-Capa HPA M4 Magazine Adapter transforms any compatible Hi-Capa GBB from a gas-dependent platform into a properly HPA-fed one. The adapter slots into the Hi-Capa magwell in place of your gas magazine, connects to an external HPA line via a US Foster fitting, and feeds BBs from a standard M4 AEG magazine — giving you the capacity, consistency, and temperature independence that GBB players switch to HPA for.
CTM have built this to a higher material standard than many budget adapters. The body is injection-moulded from glass-reinforced nylon — the same class of material used in quality trigger guards and lower receivers, significantly stronger than standard ABS polymer and resistant to the kind of impact deformation that cheaper adapters suffer under sustained use. The magazine release button is CNC machined from 6061 aluminium alloy, giving you a precise, rattle-free magazine change rather than the soft, slightly ambiguous feel of a polymer button. A keyring slot allows personal customisation or a quick-attach loop for a lanyard.
Compatible with the full range of Hi-Capa GBB platforms: WE, Armorer Works, Tokyo Marui, KJW, and SSP variants including SSP5. Also compatible with the CTM AAP-01/C CNC Magwell if you run one. Works best with PTS EPM and EPM1 M4 magazines for strong spring tension and reliable feeding.
What you need to run this adapter
| Item | Notes |
|---|---|
| HPA tank | Any paintball/airsoft HPA tank — see HPA Tanks |
| Secondary regulator | Required — AirTac AT200 or Wolverine STORM Cat5 recommended; never connect direct to a tank regulator alone |
| HPA line | US Foster (standard) fitting line — see HPA Lines |
| M4 AEG magazine | PTS EPM/EPM1 recommended for strong springs and reliable feeding |
Specifications
| Specification | Detail |
|---|---|
| SKU | CTM-KIT-0374 |
| Weight | 107g |
| Body material | Injection-moulded glass-reinforced nylon |
| Mag release material | CNC 6061 aluminium alloy |
| Valve material | 1215MS free-cutting steel |
| HPA fitting | US Foster (standard airsoft fitting) |
| Operating pressure range | 0–140psi (120psi recommended / green gas equivalent) |
| Compatible platforms | WE, Armorer Works, Tokyo Marui, KJW, SSP Hi-Capa GBB pistols |
| Magazine compatibility | Standard M4 AEG magazines; PTS EPM/EPM1 recommended |
| Colour variants | BK/GY, BU/SV, RD/GD, VT/GN, BK/GD, BK/Rainbow |
Package Contents
| Item | Qty |
|---|---|
| CTM Hi-Capa HPA M4 Magazine Adapter with rubber sealing ring | 1 |
| 2.5mm × 100mm hex head bolt with nylon gasket | 1 |
| Universal feed tube | 1 |
Usage Tips
Set your secondary regulator to approximately 120psi for a green gas equivalent output — this is the standard operating pressure for most Hi-Capa internals and produces good performance without accelerating wear. Do not exceed 140psi; higher pressures stress nozzles, O-rings, and hop-up rubbers beyond their design limits. Always rack the gun before inserting the adapter to ensure the nozzle is forward and creates a good air seal on insertion. Use high-quality M4 magazines with strong springs — worn magazine springs are the most common cause of feeding issues with HPA adapters. Do not leave M4 magazines fully loaded for extended periods; spring fatigue affects feeding consistency over time. If feeding becomes inconsistent, try replacing magazine springs with heavy-duty alternatives (superfeed springs are a popular upgrade).