LA Capa Customs Geom Hi-Capa outer barrels shown in all available colours including cyan, brown, pink, red, orange, yellow, green, blue, purple, hot pink, grey, silver and black.
Dr. Black 5.1 Type “Geom” Outer Barrel for Hi Capa
Dr. Black 5.1 Type “Geom” Outer Barrel for Hi Capa
Dr. Black 5.1 Type “Geom” Outer Barrel for Hi Capa
Dr. Black 5.1 Type “Geom” Outer Barrel for Hi Capa
Dr. Black 5.1 Type “Geom” Outer Barrel for Hi Capa
Dr. Black 5.1 Type “Geom” Outer Barrel for Hi Capa
Dr. Black 5.1 Type “Geom” Outer Barrel for Hi Capa
Dr. Black 5.1 Type “Geom” Outer Barrel for Hi Capa
Dr. Black 5.1 Type “Geom” Outer Barrel for Hi Capa
Dr. Black 5.1 Type “Geom” Outer Barrel for Hi Capa
Dr. Black 5.1 Type “Geom” Outer Barrel for Hi Capa
Dr. Black 5.1 Type “Geom” Outer Barrel for Hi Capa
Dr. Black 5.1 Type “Geom” Outer Barrel for Hi Capa
LA Capa Customs Geom Hi-Capa outer barrels shown in all available colours including cyan, brown, pink, red, orange, yellow, green, blue, purple, hot pink, grey, silver and black.Dr. Black 5.1 Type “Geom” Outer Barrel for Hi CapaDr. Black 5.1 Type “Geom” Outer Barrel for Hi CapaDr. Black 5.1 Type “Geom” Outer Barrel for Hi CapaDr. Black 5.1 Type “Geom” Outer Barrel for Hi CapaDr. Black 5.1 Type “Geom” Outer Barrel for Hi CapaDr. Black 5.1 Type “Geom” Outer Barrel for Hi CapaDr. Black 5.1 Type “Geom” Outer Barrel for Hi CapaDr. Black 5.1 Type “Geom” Outer Barrel for Hi CapaDr. Black 5.1 Type “Geom” Outer Barrel for Hi CapaDr. Black 5.1 Type “Geom” Outer Barrel for Hi CapaDr. Black 5.1 Type “Geom” Outer Barrel for Hi CapaDr. Black 5.1 Type “Geom” Outer Barrel for Hi CapaDr. Black 5.1 Type “Geom” Outer Barrel for Hi Capa

Dr. Black 5.1 Type “Geom” Outer Barrel for Hi Capa

$84.99



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Frequently Bought Together

Complete your setup with the most common add-ons.

AIP Aluminum 5.1 Guide Plug for Hi Capa

$14.99

Dr. Black 5.1 Type “Favos” Outer Barrel for Hi Capa

$84.99

LA Capa Customs "S2" Flat Trigger for Hi Capa

$17.99

SPEED Airsoft "Hex Holes" Curved Trigger for Hi Capa

$34.99

SPEED Airsoft "Hex Holes" Flat Trigger for Hi Capa

$34.99

Dr. Black 5.1 Type “GEOM” Outer Barrel for Hi Capa

Dr Black 6063 Aluminum Outer Barrel for 5.1 Hi Capa, Type GEOM

  • This Hi Capa 5.1 GBB outer barrel is designed by Dr. Black for the Tokyo Marui 5.1 GBB Airsoft pistol. CNC machined using high-quality 6063 aluminum, the barrel is incredibly durable and robust yet extremely lightweight. The outer barrel features the "GEMO257" type design and has an 11mm CW internal threading for all your muzzle accessories and attachments. Dr. Black has made their mark in the airsoft industry, featuring unique, never seen before, Hi Capa accessories that are all CNC machined using high-quality materials. Upgrade your Hi Capa with Dr. Black now!

    Features

    • Designed for Tokyo Marui Hi Capa 5.1 GBB Airsoft Pistol
    • High Grade 6063 Aluminum Build
    • Lightweight and Robust
    • "GEMO" Type Design
    • 11mm CW Threading
    • Drop-in Installation

Common Product Questions

Find quick answers about our airsoft products, shipping and policies.

Can LA Airsoft install this part for me?

Yes. We can build and upgrade Hi-Capas, AAP platforms, and rifles. Choose your base gun and parts, then add the appropriate tech service.

The current custom-build service states that builds are normally completed in approximately 3 to 5 days, with the team reviewing the selected parts for compatibility.

Do I need tools or gunsmithing?

That depends on the upgrade. Simple external parts may be straightforward, but internal upgrades can require disassembly, reassembly, adjustment and testing.

If you are not comfortable working inside your airsoft gun, our team offers professional tech and custom-build services.

How quickly will my order ship?

Orders without preorder items are typically packed the same day when placed before 4:30 p.m. Central Time. Please note that occasional delays can occur during especially busy periods or when staffing is limited.

How should I maintain this product?

Regular maintenance helps preserve performance and reliability. Keep the product clean, follow the manufacturer’s lubrication instructions, and properly manage batteries, gas systems, and internal components. More advanced repairs or internal servicing should be handled by an experienced airsoft technician.

Will this part fit my platform?

Compatibility is product-specific. Check the brand, model, size, and platform named in the product description, such as Tokyo Marui Hi-Capa 4.3 or 5.1, AAP-01, Umarex/VFC Glock, or a particular AEG gearbox type.

Similar-looking parts are not always interchangeable, so contact our team with your exact model if you are unsure.

Will this part increase my FPS?

Not every upgrade increases FPS. Some parts are designed primarily for reliability, cycling speed, weight reduction, or gas efficiency. When a product has a tested FPS claim, it should be stated in the listing.