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Sig Sauer
Overview
The SIG Sauer Stock Adapter - 1913 Interface Folding Knuckle serves as a crucial assembly component that allows for the attachment of folding stocks to your AR-15 platform. This adapter provides a robust connection for stocks designed to interface with a Picatinny rail, enhancing the versatility of your build while maintaining stability. It's commonly found in mid-length gas system builds chambered in 5.56 NATO, making it a practical choice for those looking to streamline their rifle's profile.
Based on build data
Strike Industries Flat Wire Spring for AR Carbine - AR-FWS-C
Strike Industries Extended Bolt Catch
Fortis Lightweight Enhanced AR-15 End Plate, Gold - LE-BLK-K1-GOLD
Strike Industries End Plate and Anti-Rotate Castle Nut for Receivers, Red - SI-AR-UL-MFEP&ACN-RED
Rise Armament Ar-15 Magazine Release Button - Rise Red
CMMG AR-15 HD Pivot and Takedown Pin Parts Kit - 55AFF3B
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 | 97 | |
| Strike Industries Extended Bolt Catch | 95 | |
| Fortis Lightweight Enhanced AR-15 End Plate, Gold - LE-BLK-K1-GOLD | 68 | |
| Strike Industries End Plate and Anti-Rotate Castle Nut for Receivers, Red - SI-AR-UL-MFEP&ACN-RED | 65 | |
| Rise Armament Ar-15 Magazine Release Button - Rise Red | 63 | |
| CMMG AR-15 HD Pivot and Takedown Pin Parts Kit - 55AFF3B | 63 |
| Platform | Percentage |
|---|---|
| AR-15 | 66.7% |
| AR-10 | 33.3% |
Builds in the community that include the SIG Sauer Stock Adapter - 1913 Interface Folding Knuckle
| Build | Parts | Total |
|---|---|---|
 | 22 | $2295.81 |
 | 37 | $6320.43 |
 | 22 | $3141.20 |
 | 27 | $1643.22 |
 | 27 | $2299.24 |
 | 23 | $2277.37 |
 | 30 | $3731.81 |
 | 34 | $6995.96 |
 | 27 | $1949.20 |
 | 25 | $2397.50 |
 | 23 | $4088.17 |
2 global ratings
The SIG folding adapter latches into the open position with zero play, which is what you need for a stock that takes recoil. 1913 interface gives compatibility with most folding stocks. Lockup is positive both folded and extended. Steel construction feels overbuilt in a good way.
SIG Sauer folding stock adapter for 1913 interface has a rubber butt pad on the included stock end that grips shoulders or plate carriers well. Lockup is positive in both folded and deployed states. Steel construction overbuilt for the application.
