Sig Sauer
CALX MCX-SPEAR, HYP, 6.8X51, 13"
Item # SIG CALX-HYP-SPEAR-13B-68 MSRP $1,900.00PRODUCT DETAILS
TECH SPECS:
Upgrade or repair your MCX-SPEAR with this factory-grade replacement barrel assembly: the CALX MCX-SPEAR HYP 13″ barrel in 6.8×51. Built for shooters who want a compact, high-performance chambering in a mission-configurable package, this barrel ships with a properly fitted gas block and is sold barrel-only for installation on MCX-SPEAR platforms.
Precision-machined to SIG tolerances for reliable feeding and consistent accuracy, the 13″ 6.8×51 barrel gives you a compact overall system while retaining excellent ballistic performance from the modern SIG 6.8 chambering. The included gas block allows simple installation with the correct gas system settings — ideal for suppressed or unsuppressed use when paired with the appropriate adjustable gas components.
Perfect for: owners looking to convert, replace, or shorten their MCX-SPEAR platform for close-quarters, vehicle carry, or PDW applications while keeping proven SIG performance.
Key Points
-
Model: CALX MCX-SPEAR HYP
-
Caliber: 6.8×51 (SIG 6.8 family)
-
Barrel Length: 13.0″ — compact, mission-oriented profile
-
Includes: Barrel (13″) and fitted gas block with Muzzle Device
-
Intended Platform: SIG MCX-SPEAR (HYP configuration) — fits platform variants that accept MCX-SPEAR barrels
-
Use: Suppressed/unsuppressed capable when properly configured with the correct gas system and muzzle device
-
Note: Professional installation recommended. Verify platform compatibility and local/state/NFA laws before purchase.
Why choose this barrel
-
Short, controllable 13″ length for compact handling without sacrificing modern 6.8 ballistics.
-
Supplied gas block speeds installation and reduces guesswork when setting gas for reliable cycling.
-
Ideal for mission-configurable MCX systems where barrel interchangeability is required.
| CALX MCX-SPEAR, HYP, 6.8X51, 13" | |
|---|---|
| Caliber | 6.8×51 (SIG 6.8 family) |
| Barrel Length | 13.0 in (nominal) |
| Included | 13" barrel assembly + fitted gas block |
| Intended Platform | SIG MCX-SPEAR (HYP configuration) — fits MCX-SPEAR compatible receivers/handguards |
| Operating Use | Optimized for compact/mid-length MCX SPEAR builds — suitable for suppressed and unsuppressed use when properly configured |
| Gas Block | Pre-fitted gas block included (verify gas port alignment and gas setting during installation) |
| Compatibility Notes | Barrel intended for MCX-SPEAR HYP systems. Confirm handguard length, gas system length and barrel indexing before ordering. |
| Finish / Coating | Manufacturer finish to SIG factory tolerances — confirm finish type with manufacturer or invoice |
| Restrictions / Notes | Barrel-only listing. NFA, state and local laws may apply depending on overall configuration (SBR rules). |
| Manufacturer | SIG SAUER (CALX / MCX-SPEAR family) |
Questions 0
Ask a QuestionProven Arms & Outfitters A bolt-action rifle requires the shooter to manually operate a bolt to load a round, eject the spent casing, and chamber the next round. In contrast, a semi-automatic rifle is designed to automatically eject the spent casing and chamber a new round with each pull of the trigger. Semi-automatic rifles offer faster follow-up shots, while bolt-action rifles are typically more accurate due to their design.
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PRODUCT DETAILS
TECH SPECS:
Upgrade or repair your MCX-SPEAR with this factory-grade replacement barrel assembly: the CALX MCX-SPEAR HYP 13″ barrel in 6.8×51. Built for shooters who want a compact, high-performance chambering in a mission-configurable package, this barrel ships with a properly fitted gas block and is sold barrel-only for installation on MCX-SPEAR platforms.
Precision-machined to SIG tolerances for reliable feeding and consistent accuracy, the 13″ 6.8×51 barrel gives you a compact overall system while retaining excellent ballistic performance from the modern SIG 6.8 chambering. The included gas block allows simple installation with the correct gas system settings — ideal for suppressed or unsuppressed use when paired with the appropriate adjustable gas components.
Perfect for: owners looking to convert, replace, or shorten their MCX-SPEAR platform for close-quarters, vehicle carry, or PDW applications while keeping proven SIG performance.
Key Points
-
Model: CALX MCX-SPEAR HYP
-
Caliber: 6.8×51 (SIG 6.8 family)
-
Barrel Length: 13.0″ — compact, mission-oriented profile
-
Includes: Barrel (13″) and fitted gas block with Muzzle Device
-
Intended Platform: SIG MCX-SPEAR (HYP configuration) — fits platform variants that accept MCX-SPEAR barrels
-
Use: Suppressed/unsuppressed capable when properly configured with the correct gas system and muzzle device
-
Note: Professional installation recommended. Verify platform compatibility and local/state/NFA laws before purchase.
Why choose this barrel
-
Short, controllable 13″ length for compact handling without sacrificing modern 6.8 ballistics.
-
Supplied gas block speeds installation and reduces guesswork when setting gas for reliable cycling.
-
Ideal for mission-configurable MCX systems where barrel interchangeability is required.
| CALX MCX-SPEAR, HYP, 6.8X51, 13" | |
|---|---|
| Caliber | 6.8×51 (SIG 6.8 family) |
| Barrel Length | 13.0 in (nominal) |
| Included | 13" barrel assembly + fitted gas block |
| Intended Platform | SIG MCX-SPEAR (HYP configuration) — fits MCX-SPEAR compatible receivers/handguards |
| Operating Use | Optimized for compact/mid-length MCX SPEAR builds — suitable for suppressed and unsuppressed use when properly configured |
| Gas Block | Pre-fitted gas block included (verify gas port alignment and gas setting during installation) |
| Compatibility Notes | Barrel intended for MCX-SPEAR HYP systems. Confirm handguard length, gas system length and barrel indexing before ordering. |
| Finish / Coating | Manufacturer finish to SIG factory tolerances — confirm finish type with manufacturer or invoice |
| Restrictions / Notes | Barrel-only listing. NFA, state and local laws may apply depending on overall configuration (SBR rules). |
| Manufacturer | SIG SAUER (CALX / MCX-SPEAR family) |
SORT BY MOST RECENT
No Customer Review on this product
Questions 0
Ask a QuestionProven Arms & Outfitters A bolt-action rifle requires the shooter to manually operate a bolt to load a round, eject the spent casing, and chamber the next round. In contrast, a semi-automatic rifle is designed to automatically eject the spent casing and chamber a new round with each pull of the trigger. Semi-automatic rifles offer faster follow-up shots, while bolt-action rifles are typically more accurate due to their design.
