S&T T21 Upgrade Kit for Begadi PRO NEPTUN M4 / M16 CNC Alu Rotary HopUp Unit
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S&T L2A1 Hopup Unit€14.90 -
Begadi Classic MSK CNC HopUp Unit -green-Special Price €24.90 Regular Price €32.90
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With this CNC manufactured upgrade kit our Neptun HopUp Unit can be installed in the S&T T21.
The kit includes:
- A matching CNC machined loading channel made of 7075 aluminum, which can further be adjusted in length to different magazines.
- With the original magazines this is completely screwed in.
- Gearbox Connector made of brass with matching diameter and length for the S&T T21 Gearbox and original Nozzle length.
- Guide lug for the outer barrel made of 7075 aluminum. Screwed to the front of the HopUp Unit to connect it to the Outer Barrel and prevent it from twisting.
Mounting the HopUp Unit in the gun:
First disassemble the original plastic HopUp Unit together with the Outer Barrel.
For this, the upper covers with the 21mm rail must be removed (two screws in front + long pin)
Now the Outer Barrel can be removed via the rear clamp (4 screws).
After you have assembled the Neptun with the Inner Barrel, it is first pushed over the Nozzle with the original barrel spring and pressed against the Gearbox.
Now the Outer Barrel can be slid over the Inner Barrel from the front and screwed into place.
When clamping the Outer Barrel, make sure that it is correctly aligned and that the Neptune is fully seated against the Gearbox.
Magazine Compatibility:
We have tested different magazines for you and recommend as follows:
- S&T Original (M4) Magazine - fits very well
- A&K M4 magazine - fits very well
- E&C M4 Magazine - fits very well
- ICS M4 Magazine - fits very well
- Arcturus M4 Magazine - fits very well
- Airsoft Systems M4 Magazine - fits very well
- G&G M4 Magazine - fits well
- PTS M4 Magazine - fits well
- Cyma M4 Magazine - fits tight
- Lonex M4 Magazine - fits tightly
- Battleaxe M4 Magazine - fits tightly
- E&L M4 Magazine - does not fit
The kit includes:
- A matching CNC machined loading channel made of 7075 aluminum, which can further be adjusted in length to different magazines.
- With the original magazines this is completely screwed in.
- Gearbox Connector made of brass with matching diameter and length for the S&T T21 Gearbox and original Nozzle length.
- Guide lug for the outer barrel made of 7075 aluminum. Screwed to the front of the HopUp Unit to connect it to the Outer Barrel and prevent it from twisting.
Mounting the HopUp Unit in the gun:
First disassemble the original plastic HopUp Unit together with the Outer Barrel.
For this, the upper covers with the 21mm rail must be removed (two screws in front + long pin)
Now the Outer Barrel can be removed via the rear clamp (4 screws).
After you have assembled the Neptun with the Inner Barrel, it is first pushed over the Nozzle with the original barrel spring and pressed against the Gearbox.
Now the Outer Barrel can be slid over the Inner Barrel from the front and screwed into place.
When clamping the Outer Barrel, make sure that it is correctly aligned and that the Neptune is fully seated against the Gearbox.
Magazine Compatibility:
We have tested different magazines for you and recommend as follows:
- S&T Original (M4) Magazine - fits very well
- A&K M4 magazine - fits very well
- E&C M4 Magazine - fits very well
- ICS M4 Magazine - fits very well
- Arcturus M4 Magazine - fits very well
- Airsoft Systems M4 Magazine - fits very well
- G&G M4 Magazine - fits well
- PTS M4 Magazine - fits well
- Cyma M4 Magazine - fits tight
- Lonex M4 Magazine - fits tightly
- Battleaxe M4 Magazine - fits tightly
- E&L M4 Magazine - does not fit
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