SIG Sauer Rifles
SIG Sauer MCX
Specs, variants & prices
SIG Sauer currently makes 7 versions of the MCX rifle, chambered in 300BLK, 5.56 NATO and 7.62x39. Barrels run from 6.75" to 16.25". SIG Sauer's suggested retail prices run from $2,499.99 to $2,699.99, and stores set their own prices from there. The table below lines up every version so you can compare them at a glance.
What versions of the SIG Sauer MCX are there?
7 current versions. Specs and measurements are SIG Sauer's own.
MCX-RATTLER LT
1x 30rd magazines
- Model / part #
- RMCX-300B-6B-LT-SBR
- Caliber
- 300BLK
- Capacity
- 30
- Barrel
- 6.75"
- Overall length
- 24.9"
- Weight
- 5.8 lb
- Finish
- Black Anodized
- MSRP
- $2,699.99
MCX-RATTLER LT
1x 30rd magazines
- Model / part #
- RMCX-556N-7B-LT-SBR
- Caliber
- 5.56 NATO
- Capacity
- 30
- Barrel
- 7.75"
- Overall length
- 25.9"
- Weight
- 6.2 lb
- Finish
- Black Anodized
- MSRP
- $2,699.99
MCX-SPEAR LT 5.56 16" RIFLE
1x 30rd magazines
- Model / part #
- RMCX-556N-16B-LT-B
- Caliber
- 5.56 NATO
- Capacity
- 30
- Barrel
- 16"
- Overall length
- 34.3"
- Weight
- 7.4 lb
- Finish
- Black Anodized
- MSRP
- $2,599.99
MCX-SPEAR LT IR 300 BLK 9" SBR
1x 30rd magazines
- Model / part #
- RMCX-300B-9B-IR-SBR
- Caliber
- —
- Capacity
- 30
- Barrel
- 9"
- Overall length
- 27.8"
- Weight
- 6.4 lb
- Finish
- Gen II NiR FDE Cerakote
- MSRP
- $2,499.99
MCX-SPEAR LT IR 5.56 11.5" SBR
1x 30rd magazines
- Model / part #
- RMCX-556N-11B-IR-SBR
- Caliber
- 5.56 NATO
- Capacity
- 30
- Barrel
- 11.5"
- Overall length
- 29.5"
- Weight
- 6.9 lb
- Finish
- Gen II NiR FDE Cerakote
- MSRP
- $2,499.99
MCX-SPEAR LT IR 5.56 NATO 16"
1x 30rd magazines
- Model / part #
- RMCX-556N-16B-IR
- Caliber
- 5.56 NATO
- Capacity
- 30
- Barrel
- 16"
- Overall length
- 35.1"
- Weight
- 7.5 lb
- Finish
- Gen II NiR FDE Cerakote
- MSRP
- $2,599.99
MCX-SPEAR LT IR 762x39 16" RIFLE
1x 28rd magazines
- Model / part #
- RMCX-762R-16B-IR
- Caliber
- 7.62x39
- Capacity
- 28
- Barrel
- 16.25"
- Overall length
- 35.25"
- Weight
- 7.6 lb
- Finish
- Gen II NiR FDE Cerakote
- MSRP
- $2,599.99
What calibers does the MCX come in?
It's chambered in 300BLK, 5.56 NATO and 7.62x39, depending on the version.
How much does a SIG Sauer MCX cost?
SIG Sauer's suggested retail prices run from $2,499.99 to $2,699.99, depending on the version. Tap “See prices” next to any version to see what retailers are asking.
Can you buy one in California or Massachusetts?
California and Massachusetts both limit which models dealers can sell, and the rules differ by type of gun. State rules change, so check our California and Massachusetts pages before you buy.
What's the latest on the MCX?
Nothing new on the MCX lately.
Specs from SIG Sauer, checked October 22, 2026 (source). Spot a mistake? Let us know and we'll fix it. SIG Sauer is a trademark of its owner, listed for identification only. Firearms Almanac isn't affiliated with SIG Sauer.