Airsoft Upgrades

T-N.T. Studio APS-X HOP-UP System H+ Retrofit Kit for GHK M4 GBB (320mm)

Brand: T-N.T. StudioCategory: GBBR Buckings & Nubs2 retailers

Currently out of stock across all retailers.

Prices last checked July 30, 2026 across 2 retailers.

T-N.T. Studio APS-X HOP-UP System H+ Retrofit Kit for GHK M4 GBB (320mm) price comparison: the lowest price is $104.57 at Rainbow8, the highest is $122.97, and the median across 2 tracked listings is $113.77. Comparing retailers can save up to 15% ($18.40) versus the highest-priced listing.

Powerplant: GBBR

Fits models: GHK AK, WA-pattern / GHK

Compatible with: M4/AR

See all WA-pattern / GHK magazines & fitment →

Which buckings fit GBBR? Compare fitment & degrees →

Where to buy the T-N.T. Studio APS-X HOP-UP System H+ Retrofit Kit for GHK M4 GBB (320mm): prices at 2 retailers

  • Rainbow8: $104.57 — Out of Stock
  • eHobby Asia: $122.97 — Out of Stock

Frequently asked questions about the T-N.T. Studio APS-X HOP-UP System H+ Retrofit Kit for GHK M4 GBB (320mm)

How much does the T-N.T. Studio APS-X HOP-UP System H+ Retrofit Kit for GHK M4 GBB (320mm) cost?
The T-N.T. Studio APS-X HOP-UP System H+ Retrofit Kit for GHK M4 GBB (320mm) ranges from $104.57 to $122.97 across 2 retailers. Prices are updated regularly from each store's live catalog.
Is the T-N.T. Studio APS-X HOP-UP System H+ Retrofit Kit for GHK M4 GBB (320mm) in stock?
The T-N.T. Studio APS-X HOP-UP System H+ Retrofit Kit for GHK M4 GBB (320mm) is currently out of stock across all 2 tracked retailers. You can set up a price alert to get notified when it becomes available again.
What is the T-N.T. Studio APS-X HOP-UP System H+ Retrofit Kit for GHK M4 GBB (320mm) compatible with?
It is designed for GBBR platform and fits GHK AK, WA-pattern / GHK models.
Is the T-N.T. Studio APS-X HOP-UP System H+ Retrofit Kit for GHK M4 GBB (320mm) a good gbbr buckings & nubs upgrade?
The T-N.T. Studio APS-X HOP-UP System H+ Retrofit Kit for GHK M4 GBB (320mm) by T-N.T. Studio is listed in our GBBR Buckings & Nubs category and is priced from $104.57. We aggregate prices from 2 retailers so you can compare and find the best deal. Check the price comparison table above for current pricing from each store.

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