T-N.T. Studio APS-X HOP-UP System H+ Retrofit Kit for GHK M4 GBBR (370mm)

The T-N.T. hop up retrofit kit for the GHK M4 GBBR is a premium upgrade over the stock ones found in the out of the box guns listed. The kit ensures better accuracy due to better and finer tuning of the hop up. Length: 370mm