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SIG SAUER Cal-x Kit, Sigmcx, 5.56 Nato, 9in, Lt, W WCALX-MCX-556N-9B-LT Magazine Capacity: 0 Round, Magazine Included: No, 23% Off and Coupon Available w/ Free S&H

CAL-X KIT, SIGMCX, 5.56 NATO, 9IN, LT, W
CAL-X KIT, SIGMCX, 5.56 NATO, 9IN, LT, W
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CAL-X KIT, SIGMCX, 5.56 NATO, 9IN, LT, W

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Questions & Answers
can I install this on a mcx virtus?

were about to find out. I ordered the mcx virtus cal exchange kit that was supposed to have the bolt and taper ring and this is what was sent. I asked about the missing parts and they just gave me sigs phone number. ill come back and reply whether it works or not tonight when I try to install it.

by Rob, Verified Owner, December 1, 2025
Not quite understanding why this barrel is restricted. Civilians have access to the smaller and larger versions. This is the only length we can't get. Can you answer this question?
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Magazine Capacity:
0 Round

Code: SD9-CNC-SSWCALX-WCALX-MCX-556N-9B-LT-0RD

MPN: WCALX-MCX-556N-9B-LT

UPC: 798681682300

14%
Product Discount
On Sale
List: $999.99Save 23%
$769.99

Product Info for SIG SAUER Cal-x Kit, Sigmcx, 5.56 Nato, 9in, Lt, W

Sig Sauer Offers Upper Assemblies And Caliber Exchange Kits In Various Barrel Lengths. All Nfa Rules Apply To Installation Of These Upper Assemblies To Lower Receivers And Caliber Exchange Kits To Upper Receivers. Upper Assemblies And Caliber Exchange Kits With Barrel Lengths Less Than 16 ?may Only Be Affixed To Lower Receivers Which (1) Are Not Recorded As A Rifle Lower By The Manufacturer And Do Not Have A Stock Attached To The Lower Receiver Or (2) Registered With The Batfe As A Short Barreled Rifle (sbr).image

Specifications for SIG SAUER Cal-x Kit, Sigmcx, 5.56 Nato, 9in, Lt, W:

Manufacturer: SIG SAUER
Magazine Capacity: 0 Round
Magazine Included: No

Package Contents:

  • SIG SAUER Cal-x Kit, Sigmcx, 5.56 Nato, 9in, Lt, W

SIG SAUER Cal-x Kit, Sigmcx, 5.56 Nato, 9in, Lt, W Orderable Models

List of Orderable Models

  • SIG SAUER Cal-x Kit, Sigmcx, 5.56 Nato, 9in, Lt, W - WCALX-MCX-556N-9B-LT-0RD , MPN: WCALX-MCX-556N-9B-LT , UPC: 798681682300 , Code: SD9-CNC-SSWCALX-WCALX-MCX-556N-9B-LT-0RD
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Last updated 2026-07-07 UTC.