rifle · select-fire | Poland
| Caliber | 7.62×51mm NATO |
|---|---|
| Barrel | 508 mm (20.0 in) |
| Weight | 4100 g (144.6 oz, manufacturer figure) |
| Capacity | 20 rounds |
| Action | select-fire |
| Cyclic rate | 700 rpm |
| Manufacturer | FB Radom |
| Country | Poland |
The MSBS Grot .308 S20 is a select-fire rifle chambered in 7.62×51mm NATO, built by FB Radom in Poland. From its 508 mm (20.0 in) barrel, Magtech FMJ (147 gr FMJ) leaves the muzzle at about 2739 fps (835 m/s), adjusted from the 610 mm test barrel the figure was measured in. Zeroed at 100 m, the bullet drops 131 mm by 200 m with 2239 J (1651 ft-lb) left. At the muzzle that is enough to defeat Drywall, Plate Glass, Pine Wood, Brick and Kevlar NIJ IIIA, and not enough for AR500 Steel. It feeds from a 20-round magazine.
Computed by the BallisticEngine engine for this barrel length, zeroed at 100 m, 15 °C, sea level, no wind.
| Distance | Drop | Velocity | Energy | Time |
|---|---|---|---|---|
| 100 m | 0 mm | 758 m/s | 2737 J | 0.13 s |
| 200 m | -131 mm | 685 m/s | 2239 J | 0.27 s |
| 300 m | -473 mm | 617 m/s | 1813 J | 0.42 s |
| 500 m | -1997 mm | 493 m/s | 1159 J | 0.78 s |
Against a semi-infinite block of each material, with Magtech FMJ at the muzzle. The verdict compares the depth reached against a realistic barrier thickness.
| Material | Verdict | Depth |
|---|---|---|
| Drywall (½") | ✓ Full penetration | 457 mm |
| Plate Glass (¼") | ✓ Full penetration | 36 mm |
| Pine Wood (1") | ✓ Full penetration | 428 mm |
| Brick (4") | ✓ Full penetration | 239 mm |
| AR500 Steel (⅜") | ✗ Stopped | 8 mm |
| Kevlar NIJ IIIA | ✓ Full penetration | 15 mm |
| Load | Mass | Velocity | Type | BC (G1) |
|---|---|---|---|---|
| Black Hills Black Hills 7.62×51mm NATO 175gr Match OTM | 175 gr | 2600 fps (793 m/s) | BTHP | 0.505 |
| Federal Federal Gold Medal Sierra MatchKing, 7.62x51mm NATO, 175 Grain, Sierra Matchking Boat-Tail Hollow Point, 2600 fps | 175 gr | 2600 fps (793 m/s) | HP | 0.505 |
| Magtech Magtech 7.62×51mm NATO 147gr FMJ | 147 gr | 2800 fps (853 m/s) | FMJ | 0.393 |
| PMP PMP 7.62×51mm NATO 147gr FMJ M80 | 147 gr | 2800 fps (853 m/s) | FMJ | 0.393 |
| Sig Sauer Sig Sauer 7.62×51mm NATO 147gr Marksman FMJ | 147 gr | 2800 fps (853 m/s) | FMJ | 0.393 |
| Winchester Winchester 7.62 x 51mm NATO 147gr Full Metal Jacket USA | 147 gr | 2750 fps (838 m/s) | FMJ | 0.415 |
| Winchester Winchester 7.62 x 51mm NATO 149gr Full Metal Jacket USA | 149 gr | 2790 fps (850 m/s) | FMJ | 0.456 |
7 loads available in 7.62×51mm NATO.