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SIG SG 550/551 Technical Specifications
| Model | SG 550 | SG 551 |
|---|---|---|
| Caliber | .223 | .223 |
| Overall length | 39.3 in | 32.5 in |
| Length with butt folded | 30.4 in | 23.6 in |
| Barrel length | 20.8 in | 16.0 in |
| Rifling twist | 7 in | 7 in |
| Number of grooves | 6 | 6 |
| Sights | diopter | diopter |
| Sight Radius | 21.2 in | 18.3 in |
| Weight: with empty magazine and bipod |
9.0 lbs. | 7.7 lbs. |
| Trigger pull weight | 6.6 lbs. | 6.6 lbs. |