# Sig Sauer AR Style Rifles - Guns For Sale

Shop Sig Sauer AR style rifles and related AR-platform options, including SIGM400 and M400 Tread 5.56 NATO rifles, MCX-Spear LT 7.62x39 upper kits, MCX Virtus pistols, and PM400 .223 Rem models. This tag covers semi-auto builds in common rifle calibers with black, matte black, tactical, and Rose Gold finishes.

Find 16-inch M400 carbines, 11.5-inch MCX upper configurations, .223 Wylde options, and 30-round-capacity AR-15 pattern firearms in one focused catalog group. These products fit buyers comparing Sig Sauer AR-style rifles, uppers, and pistols by caliber, barrel length, finish, and configuration.

## Featured Firearms (24 total)

| Product | Caliber | Price |
|---------|---------|-------|
| [Sig Sauer MCX Rattler .300 AAC Blackout 5.5in Black](https://gunsnation.com/p/sig-sauer-mcx-rattler-300-aac-blackout-5-5in-black/UCE3nOWKv) | .300 AAC Blackout | - |
| [Sig Sauer M400 Tread V2 TacPac 5.56 NATO 16in](https://gunsnation.com/p/sig-sauer-m400-tread-v2-tacpac-5-56-nato-16in/UCE3nP2PW) | 5.56 NATO | - |
| [Sig Sauer MCX Spear-LT 5.56 NATO 11.5in FDE](https://gunsnation.com/p/sig-sauer-mcx-spear-lt-5-56-nato-11-5in-fde/UCE3nP17T) | 5.56 NATO | - |
| [Sig Sauer M400 5.56 NATO 16in Black](https://gunsnation.com/p/sig-sauer-m400-5-56-nato-16in-black/UCE3nP81q) | 5.56 NATO | - |
| [Sig Sauer MCX 7.62x39 16in Black](https://gunsnation.com/p/sig-sauer-mcx-7-62x39-16in-black/UCE3nP2Ej) | 7.62X39 | - |
| [Sig Sauer MCX 5.56 NATO 16in Black](https://gunsnation.com/p/sig-sauer-mcx-5-56-nato-16in-black/UCE3nOniN) | 5.56 NATO | - |
| [Sig Sauer M400 5.56 NATO 16in Black](https://gunsnation.com/p/sig-sauer-m400-5-56-nato-16in-black/UCE3nOpT7) | 5.56 NATO | - |
| [Sig Sauer MCX Spear-LT .300 AAC Blackout 9in FDE](https://gunsnation.com/p/sig-sauer-mcx-spear-lt-300-aac-blackout-9in-fde/UCE3nP17M) | .300 AAC Blackout | - |
| [SIGM400 Tread: 5.56 NATO, 16" Semi-Auto Rifle - Black](https://gunsnation.com/p/sigm400-tread-5-56-nato-16-semi-auto-rifle-black/UCE3nOjlq) | 5.56 NATO | - |
| [Sig Sauer MCX Spear LT .300 AAC Blackout 9in Black](https://gunsnation.com/p/sig-sauer-mcx-spear-lt-300-aac-blackout-9in-black/UCE3nP2EE) | .300 AAC Blackout | - |
| [Sig Sauer M400 Tread Distressed OD Green 5.56 NATO Rifle](https://gunsnation.com/p/sig-sauer-m400-tread-distressed-od-green-5-56-nato-rifle/UCE3nOsEa) | 5.56 NATO | - |
| [Sig Sauer M400 Rose 5.56x45 NATO 16in Black](https://gunsnation.com/p/sig-sauer-m400-rose-5-56x45-nato-16in-black/UCE3nP5Wr) | 5.56 NATO | - |
| [Sig Sauer M400 Tread 5.56 NATO 16in Black](https://gunsnation.com/p/sig-sauer-m400-tread-5-56-nato-16in-black/UCE3nP5Bi) | 5.56 NATO | - |
| [SIG Sauer M400 Forge 5.56 NATO 16in Black](https://gunsnation.com/p/sig-sauer-m400-forge-5-56-nato-16in-black/UCE3nPCgk) | 5.56 NATO | - |
| [Sig Sauer M400 Forge 5.56 NATO 16in Concrete Gray](https://gunsnation.com/p/sig-sauer-m400-forge-5-56-nato-16in-concrete-gray/UCE3nPChr) | 5.56 NATO | - |
| [Sig Sauer M400 SDI 5.56 NATO 16in Moss Green](https://gunsnation.com/p/sig-sauer-m400-sdi-5-56-nato-16in-moss-green/UCE3nP1Wq) | 5.56 NATO | - |
| [Sig Sauer M400 Sentry 5.56 NATO 16in](https://gunsnation.com/p/sig-sauer-m400-sentry-5-56-nato-16in/UCE3nP5PM) | 5.56 NATO | - |
| [Sig Sauer M400 Forge 5.56 NATO 16in Black CA](https://gunsnation.com/p/sig-sauer-m400-forge-5-56-nato-16in-black-ca/UCE3nPCh8) | 5.56 NATO | - |
| [Sig Sauer M400 Forge 5.56 NATO 16in Black](https://gunsnation.com/p/sig-sauer-m400-forge-5-56-nato-16in-black/UCE3nPCgr) | 5.56 NATO | - |
| [Sig Sauer 516 G3 5.56 NATO 16in Bronze](https://gunsnation.com/p/sig-sauer-516-g3-5-56-nato-16in-bronze/UCE3nPBs2) | 5.56 NATO | - |

*Showing 20 of 24 products*

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*Data from [GunsNation](https://gunsnation.com)*