For cylinder conversion systems, PolarStar assigns numbers to nozzles instead of using the rifle model, since nozzle length varies between manufacturers of the same gun model. A standard MP5, for example, could require any of 4 different nozzle lengths depending on manufacturer.
Once you determine your replica's nozzle number, that number is universal across all engines using the numbered system — a #11 JACK™ nozzle will also be a #11 Kythera™ or F2™ nozzle.
Note: Kythera models built for a specific replica (e.g. A&K/JG SR-25) with a non-standard cylinder use a nozzle with a "K" prefix, since the universal numbering doesn't apply to non-standard cylinders. These "K" nozzles share the same design and profile as standard numbered nozzles and are cross-compatible. All nozzles are marked with their number except #1 — produced in far greater quantity, so left unmarked to reduce production time.
Compatibility Chart
| # | Most Commonly Used With | Tip (in) |
|---|---|---|
| 1 (Unmarked) | TM M4/M16, TM MP5 A/SD, ICS MP5 A/SD, G&G KAC SR-25E2 | 0.841 |
| 2 | CYMA AK, CYMA MP5 A/SD, G&G UMP | 0.882 |
| 4 | G&G GR-25 | 1.466 |
| 5 | ICS SIG 550/551/552 | 0.979 |
| 6 | KA FAL, TM MP5K, A&K M240 | 0.910 |
| 7 | PTS Masada, CA SCAR-L | 1.150 |
| 8 | VFC SCAR-H | 1.523 |
| 9 | E&L AK, S&T TAVOR | 0.892 |
| 11 | CA KAC LMG, VFC MP5 A/SD | 0.763 |
| 12 | LCT AK-47/74/M, LCT VSS/AS VAL | 0.851 |
| 13 | A&K MASADA/ACR, CYMA SR-25 (V2.5 Kythera SA) | 1.362 |
| 14 | KA CZ 805 BREN | 1.405 |
| 15 | JG G36 | 1.070 |
| 17 | CA AUG | 1.020 |
| 18 | G&G MP5 (Blowback) | 0.811 |
| 20 | CA G36K | 1.042 |
| 21 | Elite Force/CYMA MP5K, CA SA58 | 0.938 |
| K1 | A&K/JG SR-25 (V2.5 Kythera SA) | 1.314 |
For a full compatibility database, visit the PolarStar Help Center.
Parts and accessories ship within 7 business days. Custom HPA rifle builds take up to 45 business days (often less). Need it sooner? Contact us to check current stock.
All sales on parts and accessories are final once shipped. Defective or damaged items are covered under the KA Tech Warranty.