JSB KnockOut Slugs are lead projectiles from Czech manufacturer JSB Match Diabolo, designed for powerful PCP air rifles and precision shooting at longer ranges.
Unlike conventional airgun pellets, they have a shape similar to a firearm bullet and a hollow point (Hollow Point), which promotes deformation on impact with the target. The high ballistic coefficient (BC) helps retain velocity and energy during flight, contributes to a flatter trajectory and reduces the effects of crosswinds.
Revised MKII design
Compared with the original version, KnockOut Slugs MKII have a wider rear skirt, which provides a better seal in the barrel and reduces compressed air leakage. The revised design may contribute to greater flight stability and tighter groups. The diameter and weight remain unchanged, but the ballistic coefficient has increased from 0,084 to 0,086.
Choosing the right diameter
Every barrel has its own specific characteristics and manufacturing tolerances. Differences in projectile diameter of just hundredths of a millimetre allow you to select the ammunition best suited to a particular air rifle. Even within the same calibre, several diameters may be suitable, although their accuracy and grouping may vary.
Specifications of individual variants
| Calibre |
Projectile diameter |
Weight |
B. C. |
Pack quantity |
| 4,5 mm |
4,51 mm / .177 |
0,650 g / 10,03 gr |
0,047 |
500 pcs |
| 4,5 mm |
4,52 mm / .177 |
0,870 g / 13,43 gr |
0,066 |
400 pcs |
| 5,5 mm |
5,49 mm / .216 |
1,350 g / 20,83 gr |
0,088 |
200 pcs |
| 5,5 mm |
5,49 mm / .216 |
1,645 g / 25,39 gr |
0,084 |
200 pcs |
| 5,5 mm |
5,51 mm / .217 |
1,645 g / 25,39 gr |
0,084 |
200 pcs |
| 5,5 mm |
5,53 mm / .218 |
1,645 g / 25,39 gr |
0,084 |
200 pcs |
| 5,5 mm MKII |
5,49 mm / .216 |
1,645 g / 25,39 gr |
0,086 |
200 pcs |
| 6,35 mm |
6,37 mm / .251 |
2,170 g / 33,49 gr |
0,092 |
150 pcs |
| 6,35 mm MKII |
6,35 mm / .250 |
2,170 g / 33,49 gr |
0,093 |
150 pcs |
| 7,62 mm |
7,62 mm / .30 |
3,250 g / 50,15 gr |
0,090 |
150 pcs |
The stated ballistic coefficient values are nominal and may vary depending on the specific shooting conditions.
WARNING: Slugs are intended for use only in compatible air rifles. We strongly advise against their use in choked barrels (with a constriction at the muzzle) unless the air rifle manufacturer expressly confirms the suitability of this ammunition. An unsuitable projectile diameter or insufficient air rifle power may cause the projectile to become lodged in the barrel.