SIG Sauer MCX Stock Adapter KIT
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Sig Sauer
Overview
The SIG Sauer MCX Stock Adapter Kit is designed to allow builders to attach a standard carbine stock to their MCX platform. This adapter is compatible with Mil-Spec buffer tubes, ensuring a secure fit and reliable operation. It’s particularly well-suited for builds featuring a mid-length gas system and chambered in 5.56 NATO, making it a popular choice for those looking to enhance their rifle's versatility and ergonomics.
Specifications
Available Merchants(7)
Prices checked
Price Alert
October 2026 so far on GunPartPicker
SIG Sauer MCX Stock Adapter KIT is the most added stock adapter on GunPartPicker so far in October 2026, ahead of the Law Tactical AR Folding Stock Adapter Gen 3-M, with about 21% of all stock adapter parts added to builds. That's its 3rd straight month at #1. Builds with this stock adapter are mostly chambered in 5.56 NATO (73%), split between mid-length (57%) and carbine-length (23%) gas systems, and mostly AR-15 (93%).
Availability is good: it was in stock at one retailer or another nearly every day in September 2026, and today 5 of the 7 retailers we track have it in stock. It dipped to $121.96 at BattleHawk Armory for a stretch in September 2026, well under its usual $153.67 to $158.43, so sales do come around. Buying today, the lowest price is $151.23 at KY Gun Company, above September's low of $121.96, so a better deal may come back.
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Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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Build Configuration Breakdown
Aggregated and anonymized data showing how builders use this product
PlatformBased on real build data showing which platform (AR-15, AR-10, AR-9) builders pair with this product.
CaliberBased on real build data showing which calibers builders choose alongside this product.
Gas SystemBased on real build data showing which gas system lengths builders use with this product.
Builds Featuring This Part
See all builds →Builds in the community that include the SIG Sauer MCX Stock Adapter Kit
| Build | Parts | Total |
|---|---|---|
 | 30 | $6554.12 |
 | 31 | $7690.64 |
| 27 | $4215.43 |
 | 29 | $1877.94 |
 | 29 | $3876.14 |
 | 26 | $1206.49 |
 | 22 | $2424.70 |
 | 19 | $2885.04 |
 | 34 | $5732.22 |
| 19 | $3631.80 |
 | 37 | $4435.35 |
 | 25 | $1885.57 |
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