Upgrade or enhance your SIG rifle with these MCX and MPX uppers, caliber x-change kits, and barrels.

Back in stock with limited quantities while supplies last.

LEARN MORE ABOUT THE SIG MCX AND FIND A DEALER  LEARN MORE ABOUT THE SIG MPX AND FIND A DEALER

5.5in, 5.56 Rattler Barrel

4.7 ★★★★★ 7 Reviews

Mathew H. (Verified Buyer):

“Best. Thing. Ever.”

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5.5in, 300BLK Rattler Upper

4.8 ★★★★★ 15 Reviews

Mathew H. (Verified Buyer):

“SIG knocked it out of the park.”

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6.75in, 300BLK MCX Virtus Caliber XChange Kit

4.5 ★★★★★ 6 Reviews

Thomas C. (Verified Buyer):

“Barrel performance is outstanding.”

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9in, 300BLK MCX Virtus Caliber XChange Kit

5.0 ★★★★★ 22 Reviews

Jonathan L. (Verified Buyer):

“I love the modularity of the MCX platform.”

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9in, 300BLK MCX Virtus Upper

5.0 ★★★★★ 7 Reviews

Norman C. (Verified Buyer):

“Exceptional and high quality.”

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16in, 300BLK MCX Virtus Upper

5.0 ★★★★★ 4 Reviews

Jungle 1. (Verified Buyer):

“Great way to convert a 5.56 AR.”

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11.5in, 5.56 MCX Virtus Upper

4.5 ★★★★★ 13 Reviews

Brady S. (Verified Buyer):

“Such a great bargain for everything you get..”

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4.5in/6in/8in, MPX G2 Barrels

4.7 ★★★★★ 22 Reviews

Anthony S. (Verified Buyer):

“Great barrel, perfect fit, worth the money.”

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SIG SAUER Inc.,

72 Pease Boulevard, Newington, NH 03801

(603) 610-3000

sigsauer.com