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Sig Sauer
Overview
The SIG Sauer MCX Stock Adapter Kit converts an MCX lower receiver to accept a standard AR-15 buffer tube and stock assembly. This allows builders to integrate AR-pattern stocks onto the MCX platform, expanding stock compatibility beyond proprietary MCX options. The adapter is designed to interface with Mil-Spec carbine buffer tubes. GPP build data shows this adapter is commonly used in builds featuring a Mid-Length gas system and chambered in 5.56 NATO. Builders on GPP commonly pair this adapter with the Strike Industries Flat Wire Spring for AR Carbine, the Strike Industries Extended Bolt Catch, and the Geissele Automatics Premium Mil-Spec Buffer Tube Assembly With Super 42 H3.
Pros
Trade-offs
Based on build data

Strike Industries Flat Wire Spring for AR Carbine - AR-FWS-C

Geissele Automatics Premium Mil-Spec Buffer Tube Assembly With Super 42 H3 - Ddc

Fortis Light Weight K1 Castle Nut and End Plate Black, Flat Dark Earth - LEBLKK1FDE

CMMG AR-15 HD Pivot and Takedown Pin Parts Kit - 55AFF3B

Strike Industries Extended Bolt Catch

Bravo Company Ar-15/m16 Bcm Mil-Spec 6 Position Receiver Extension
Aggregated and anonymized data showing how builders use this product
| Product | Category | Times Built Together |
|---|---|---|
| Strike Industries Flat Wire Spring for AR Carbine - AR-FWS-C | 37 | |
| Geissele Automatics Premium Mil-Spec Buffer Tube Assembly With Super 42 H3 - Ddc | 26 | |
| Fortis Light Weight K1 Castle Nut and End Plate Black, Flat Dark Earth - LEBLKK1FDE | 23 | |
| CMMG AR-15 HD Pivot and Takedown Pin Parts Kit - 55AFF3B | 21 | |
| Strike Industries Extended Bolt Catch | 21 | |
| Bravo Company Ar-15/m16 Bcm Mil-Spec 6 Position Receiver Extension | 20 |
| Platform | Percentage |
|---|---|
| AR-15 | 80% |
| AR-10 | 16% |
| AR-9 | 4% |
| Caliber | Percentage |
|---|---|
| 5.56 NATO | 75% |
| 300 Blackout | 18.8% |
| .458 SOCOM | 6.3% |
| Gas System | Percentage |
|---|---|
| Mid-Length | 58.3% |
| Carbine | 25% |
| Pistol | 16.7% |
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