THE OFFICIAL HOME OF KNUCKLESGSM

GAS BLOWBACK.
NO SHORTCUTS.

Real parts. Real testing. A home for the airsoft gas blowback community.

HI-CAPAGAS BLOWBACKPARTS TESTINGCUSTOM BUILDSINSTALL GUIDES

01 / WHY WE DO IT

FOR THE
GAS NUTS.

If it's gas blowback, we're interested.

KnucklesGSM is built around hands-on airsoft reviews, component testing, technical walkthroughs and custom work. We're here to share what we learn and make useful parts for the platforms we love.

EXPLORE THE YOUTUBE CHANNEL

02 / THE SHOP

THE ORIGINAL KNUCKLES CUSTOMS

SMALL PART.
BIG DIFFERENCE.

PRODUCT / 001

KC Full Auto BBU conversion kit shown with disconnector

KC / CUSTOMS

Original KC product photographs. Select a photo to view.

FEATURED CUSTOM PART KC-001

KC FULL
AUTO BBU.

Full-auto conversion kit for compatible Tokyo Marui Hi-Capa gas blowback pistols.

COMPATIBILITYTOKYO MARUI HI-CAPA 5.1 / 4.3

IN THE KITBBU + FULL-AUTO DISCONNECTOR

AVAILABILITYSEE KO-FI FOR ORDER DETAILS

BUY ON KO-FI

Secure checkout and shipping are handled on Ko-fi. Exact inventory count coming soon.

WATCH THE INSTALL GUIDE

03 / ON THE BENCH

TEST / TUNE / LEARN

SEE IT
IN ACTION.

Get a closer look before you build. Watch the KC Full Auto BBU installation walkthrough, then explore more testing and reviews on the channel.

ALL VIDEOS ON YOUTUBE

VIDEO 001 / INSTALLATION

01PARTS REVIEWS↗ 02GAS BLOWBACK TESTING↗ 03HOW-TO GUIDES↗

Original white and charcoal Knuckles Customs mechanical emblem

ORIGINAL ARTWORK / OHL

04 / THE STORY

BUILT ON
OBSESSION.

Knuckles Customs is rooted in a long-running love for gas blowback airsoft. The goal is simple: keep experimenting, review what actually works, and share useful information with other enthusiasts.

Our original artwork—created by Ohl—has been part of the identity for more than 15 years. The name, the logo, the spirit: still the same.

SUPPORT THE CHANNEL

05 / STAY CONNECTED

FIND US WHERE THE BUILDS HAPPEN

JOIN THE
CONVERSATION.

New videos, new experiments, new parts. Follow along with KnucklesGSM on the platforms you already use.

QUESTIONS ABOUT A PART OR ORDER?CONTACT VIA KO-FI

GAS BLOWBACK.NO SHORTCUTS.

FOR THEGAS NUTS.

SMALL PART.BIG DIFFERENCE.

KC FULLAUTO BBU.

SEE ITIN ACTION.

KC FULL AUTO BBUINSTALLATION

BUILT ONOBSESSION.

JOIN THECONVERSATION.