Sig Sauer MCX-SPEAR 7.62 NATO 16 in Semi-Auto Rifle, Coyote/Tan, Short-Stroke Piston, Threaded 5/8x24
This Sig Sauer MCX-SPEAR is a 7.62×51 NATO, full-size, short-stroke gas piston rifle finished in coyote/tan and built in the USA. It features a 16 inch threaded barrel with a three-port muzzle brake, a full-length MIL-STD-1913 top rail, and a free-float M-LOK handguard with the MCX handguard link. This example is configured with a B5 Systems collapsible stock on a carbine receiver extension adapter mounted to the rear 1913 folding hinge, and it retains ambidextrous controls with a left-side, non-reciprocating charging handle.
Condition
Overall Condition: Good condition, showing some signs of prior use and handling.
Bore Overall Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: Markings from previous handling and indications of heavy use are present on exterior surfaces. Please refer to the pictures for a close look.
What’s Included
- B5 Systems collapsible stock (installed)
- 1x 25rd Magpul PMAG LR/SR GEN M3 7.62×51 magazine (polymer)
The receiver is marked "SIGMCX-SPEAR MULTI-CALIBER" and the barrel is marked "7.62 NATO," reflecting the MCX architecture’s multi-caliber design with a 7.62×51 chamber on this rifle. The platform uses a buffer-tube-less MCX layout with a rear 1913 Picatinny folding hinge; this rifle adds a carbine receiver extension adapter to support the installed B5 Systems collapsible stock while retaining the folding capability.
The 16 inch barrel is threaded 5/8x24 and fitted with a three-port muzzle brake with a mounting collar. A two-position gas valve (normal/suppressed) specific to the 7.62×51 configuration supports reliable function across conditions.
Controls are fully ambidextrous, including the bolt catch/release, magazine release, and safety selector. A left-side, non-reciprocating charging handle, ejection-side dust cover, and forward assist round out the duty-focused control set.
The handguard is a free-float M-LOK design with the MCX handguard link and a full-length MIL-STD-1913 top rail that bridges the receiver and handguard. The rifle is finished in coyote/tan, includes a SIG SAUER polymer pistol grip, and ships with a 25-round PMAG for a 25+1 capacity.