Sig Sauer MCX SBR 5.56 NATO, 11.5 in, Midwest Industries M-LOK Handguard, Geissele Super MCX Charging Handle, UTG Flip-Up Sights
This Sig Sauer MCX short-barreled rifle is a 5.56 NATO, 11.5-inch configuration built on the MCX short-stroke gas piston system. It features a Midwest Industries free-float MCX M-LOK handguard installed, a Geissele Super MCX charging handle, UTG flip-up sights, and a two-rod collapsing stock. The bore is excellent, and the rifle comes with an additional suppressor-length M-LOK handguard, a soft case, and a 30-round Magpul PMAG.
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: This rifle shows minimal evidence of handling. The bore is clean and shiny, and the firearm presents in excellent working order.
What’s Included
- Soft case
- 1x 30-round Magpul PMAG polymer magazine
- Midwest Industries free-float MCX M-LOK handguard (installed)
- Additional suppressor-length M-LOK handguard
- UTG flip-up front and rear sights (installed)
- Geissele Automatics Super MCX charging handle (installed)
- Vertical foregrip (installed)
- Three-port muzzle brake (installed)
This MCX is configured as an NFA short-barreled rifle with an 11.5-inch threaded barrel and an installed three-port muzzle brake. The rifle uses the MCX internal recoil system, eliminating the need for a buffer tube and providing a rear 1913 interface.
The installed Midwest Industries MCX M-LOK free-float aluminum handguard has an interrupted/open 12 o'clock with short Picatinny sections (for mounting a front sight) and does not bridge continuously over the receiver. An additional suppressor-length M-LOK handguard is included for alternate setups.
Controls and furniture are well-sorted: a Geissele Super MCX charging handle (P/N 05-635) is installed, along with UTG flip-up front and rear sights, a vertical foregrip, and a SIG polymer pistol grip. The two-rod collapsing stock with a QD sling socket provides an approximate 8–12 inch length of pull.
Dust cover is marked "MULTI-CAL"; the left side of the lower receiver is roll-marked "SIG MCX MULTI-CALIBER." There is additional "PITTSBURGH, PA." engraving inside the trigger guard. Capacity is 30+1, and the rifle is chambered in 5.56mm NATO. Country of origin is USA.