6mm Customs — high-end airsoft upgrades and repairs
Custom airsoft AEG with exposed gearbox internals
Now accepting · Mail-in AEG repairs & custom builds

Mail-in AEG repair and custom performance builds.

Preventative Maintenance & Repairs, SSG and DSG builds, and Accuracy Package for V2, V3, and V6 electric AEGs. No gas blowback, HPA, or V7.

High-Speed SSG Build $630

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Secure checkout · Stripe
Visa · MC · Amex · Apple Pay
Insured UPS & USPS shipping
Build cert with every job
90-day labor warranty

150+

Total builds completed

Nationwide

Mail-in service

Itemized

Estimates before work

Documented

Testing on completed jobs

What we do

From a quick tune-up to a one-of-one build.

Mail-in AEG work performed by an experienced airsoft tech, with itemized pricing and documented testing.

Preventative Maintenance & Repairs

Fault finding, repairs, and preventative care for V2, V3 and V6 electric AEGs. Quoted after inspection. One upgrade allowed; multiple upgrades require a full build.

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High-Speed SSG Builds

Electric AEG work for V2, V3 and V6 with Real Deal 8 mm low-profile bushings and a high-speed piston head. Your existing gearbox shell is reused.

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DSG Builds

35+ rps with full-cycle reliability. Pre-engagement and AOE precision tuning.

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Accuracy Package

Hop-up package only: Maxx M4E 2026 chamber, correctly sized Real Deal 6.02 mm barrel, and Mutation LC 65-degree bucking. Price set with the quote.

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Featured Builds

Recent work off the bench

Every build ships with chrono data, ROF results, and a digital build certificate.

Gearbox Rebuild & Diagnostics
Repair

Gearbox Rebuild & Diagnostics

V2 internals · Tuned AOE

Custom AR Build
Custom

Custom AR Build

Custom finish · Carbon outer · Full overhaul

See the full build gallery →
The Process

Transparent from intake to delivery.

01

Request a Quote

Tell us about your replica and goals. We normally respond within 2 business days.

02

Estimate & Approval

Detailed scope, parts list, and a transparent labor breakdown.

03

Build & QA

Bench-tested, chrono'd, ROF verified — every cycle.

04

Ship with Cert

Tracked shipping plus a signed digital build certificate.

What customers say

Trusted by players, milsim units, and pro teams.

Customer Reviews · past customer experiences

See all

Reviews reflect the customer’s experience and terms at the time of service. Current warranty terms apply to all new work.

"Isaac built me the best DSG I've ever seen in my years of playing airsoft. The amount of testing, tuning and craftsmanship that went into the gearbox was well worth everything I put into it. Isaac is the only tech I'll have work on my guns."

Matt Ames

DSG Kriss Vector build

"Excellent service, advice, communication, and attention to detail — only the best parts installed with the best work. Tuned to perfection: shoots right at 350 FPS with a deviation of only 0.3 FPS. Lifetime warranty as the cherry on top."

Ben M.

13:1 CQB build

"Sent my CM16 for an accuracy upgrade and general maintenance and they absolutely delivered. Noticeable improvement to accuracy, fantastic communication, and a fantastic price. Highly recommend 6mmCustoms for any tech work."

Michael Powers

G&G CM16 Predator upgrades

Ready to build something serious?

Get a detailed estimate, timeline, and ticket number in under two minutes.

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