Shooting Illustrated’s Ed Friedman discusses the SIG 556R. Chambered in 7.62 X 39 mm, the SIG 556R features a Swiss folding stock, and an M1913 rail for accessory attachment.
Sig 556R Specs:
- Caliber: 7.62 X 39 mm
- Overall Length: 35.875 in
- Rifling: 1 in 9.5 in
- Number of Grooves: 4
- Barrel Length: 16.0 in
- Weight w/out Mag: 7 lbs 0 oz
- Mag Capacity: 30 Rounds
- Accessory Rail: No
- Features: Mini Red Dot Sight