| Model | Time | Internal | note |
| MP2A1 | '22 AUG | 1st | Starts from NGS072210001 |
| MP2A1 | '23 JAN | 2nd | Starts from NGS072220001 |
| MP2A1 | '23 MAY | 3rd | Start from NGS072310001(?) |
| MP2A1 Pro Elite | '23 AUG | CO2 | Steel Bolt; *1 |
| UZI50 | '23 NOV | CO2 | *1 |
| UZIVN*2 | '23 DEC | 3rd | Incompatible with CO2 |
| UZIFAZ*3 | '24 MAY | 3rd | Incompatible with CO2 |
| UZIVN_JP*4 | '24 MAY | 3rd | Incompatible with CO2 |
| UZI60 | '24 AUG | 3rd+ | Compatible with CO2; *5 |
| MP2A1 | '24 NOV | 3rd+ | Compatible with CO2; *6 |
| MINI | '25 JAN | 4th | Compatible with CO2; 60° Hop Up packing is introduced. |
Note:
1. It comes with the "Hot Weather O-ring"(The O ring is no longer to serve) and the CO2 Nozzle, which makes it work with CO2 magazines in hot environments. Please replace it with the "Cold Weather CO2 O-ring" when the temperature is lower than 26°C for optimal performance.
2. Interarms markings with glossy finish.
3. Belgian markings with glossy finish, exclusively available at Krale Shop.
4. Additional Interarms markings with glossy finish.
5. It comes with the "All Weather CO2 O-ring" and the CO2 Nozzle, which enables compatibility with both CO2 and gas magazines in a wider temperatures range. However, While it offers extended operational temperatures compared to "Cold and Hot Weather CO2 O-rings", peak performance may vary across this range.
6. It comes with the "Cold Weather CO2 O-ring" and the CO2 Nozzle, which optimizes performance with CO2 magazines in cold environments. For temperatures above 28°C, please replace it with the "Hot Weather O-ring"(The O ring is no longer to serve) to ensure proper operation.
O-ring Size Chart:
| Descriptions | Outer diameter | Wire | Note |
| Cold Weather CO2 O-ring (Blue Zip Bag) |
21mm | 2mm | It's also the O-ring for the gas MP2A1s. Recommend to use replace under 20 Celcius degrees. |
| All Weather CO2 O-ring (Green Zip Bag) |
20mm | 2.4mm |