rifle · semi-auto | Germany
| Caliber | 5.56×45mm NATO |
|---|---|
| Barrel | 419 mm (16.5 in) |
| Weight | 3850 g (135.8 oz, manufacturer figure) |
| Capacity | 30 rounds |
| Action | semi-auto |
| Manufacturer | HK |
| Country | Germany |
The HK MR556A1 is a semi-auto rifle chambered in 5.56×45mm NATO, built by HK in Germany. From its 419 mm (16.5 in) barrel, Hornady 5.56 NATO FMJ (M193) Frontier® (55 gr FMJ) leaves the muzzle at about 3166 fps (965 m/s), adjusted from the 508 mm test barrel the figure was measured in. Zeroed at 100 m, the bullet drops 104 mm by 200 m with 895 J (660 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 30-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 | 831 m/s | 1230 J | 0.11 s |
| 200 m | -104 mm | 709 m/s | 895 J | 0.24 s |
| 300 m | -405 mm | 598 m/s | 637 J | 0.40 s |
| 500 m | -1961 mm | 414 m/s | 306 J | 0.80 s |
Against a semi-infinite block of each material, with Hornady 5.56 NATO FMJ (M193) Frontier® at the muzzle. The verdict compares the depth reached against a realistic barrier thickness.
| Material | Verdict | Depth |
|---|---|---|
| Drywall (½") | ✓ Full penetration | 385 mm |
| Plate Glass (¼") | ✓ Full penetration | 26 mm |
| Pine Wood (1") | ✓ Full penetration | 286 mm |
| Brick (4") | ✓ Full penetration | 173 mm |
| AR500 Steel (⅜") | ✗ Stopped | 7 mm |
| Kevlar NIJ IIIA | ✓ Full penetration | 14 mm |
| Load | Mass | Velocity | Type | BC (G1) |
|---|---|---|---|---|
| Aguila Aguila 5.56×45mm NATO 55gr FMJ M193 | 55 gr | 3165 fps (965 m/s) | FMJ | 0.243 |
| Aguila Aguila 5.56×45mm NATO 62gr FMJ SS109 | 62 gr | 3020 fps (921 m/s) | FMJ | 0.304 |
| Black Hills Black Hills 5.56×45mm NATO 36gr Varmint Grenade | 36 gr | 3750 fps (1143 m/s) | HP | 0.165 |
| Black Hills Black Hills 5.56×45mm NATO 55gr M193 FMJ | 55 gr | 3250 fps (991 m/s) | FMJ | 0.243 |
| Black Hills Black Hills 5.56×45mm NATO 62gr Mk318 Mod0 SOST | 62 gr | 3025 fps (922 m/s) | FMJ | 0.307 |
| Black Hills Black Hills 5.56×45mm NATO 62gr TSX | 62 gr | 3100 fps (945 m/s) | SP | 0.310 |
| Black Hills Black Hills 5.56×45mm NATO 77gr Mk262 Mod1 OTM | 77 gr | 2750 fps (838 m/s) | BTHP | 0.370 |
| Federal Federal American Eagle Rifle, 5.56x45mm, 55 Grain, Full Metal Jacket Boat-Tail, 3165 fps | 55 gr | 3165 fps (965 m/s) | FMJ | 0.246 |
| Federal Federal Federal Training, 5.56x45mm, 55 Grain, Full Metal Jacket Boat-Tail, 3165 fps | 55 gr | 3165 fps (965 m/s) | FMJ | 0.246 |
| Fiocchi Fiocchi 5.56 NATO 55gr Full Metal Jacket Boat-Tail | 55 gr | 3240 fps (988 m/s) | FMJ | 0.243 |
| Fort Scott Fort Scott 5.56×45mm NATO 62gr TUI | 62 gr | 3020 fps (921 m/s) | HP | 0.270 |
| G2 Research G2 Research 5.56×45mm NATO 65gr RIP HP | 65 gr | 2850 fps (869 m/s) | HP | 0.200 |
| Hornady Hornady 5.56 NATO 55 gr FMJ (M193) Frontier® | 55 gr | 3240 fps (988 m/s) | FMJ | 0.243 |
| Hornady Hornady 5.56 NATO 55 gr HP Match™ Frontier® | 55 gr | 3240 fps (988 m/s) | BTHP | 0.254 |
| Hornady Hornady 5.56 NATO 55 gr. CX® Superformance® | 55 gr | 3240 fps (988 m/s) | SP | 0.270 |
| Hornady Hornady 5.56 NATO 62 gr FMJ Frontier® | 62 gr | 3060 fps (933 m/s) | FMJ | 0.274 |
| Hornady Hornady 5.56 NATO 62 gr FMJ Hornady BLACK® | 62 gr | 3060 fps (933 m/s) | FMJ | 0.274 |
| Hornady Hornady 5.56 NATO 68 gr BTHP Match™ Frontier® | 68 gr | 2960 fps (902 m/s) | BTHP | 0.355 |
| Hornady Hornady 5.56 NATO 75 gr BTHP Match™ T2 Frontier® | 75 gr | 2910 fps (887 m/s) | BTHP | 0.355 |
| Hornady Hornady 5.56 NATO 75 gr BTHP Superformance® Match™ | 75 gr | 2910 fps (887 m/s) | BTHP | 0.395 |
38 loads available in 5.56×45mm NATO; 20 shown.