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Spro USA
Overview
The Sprinco USA Spring Kit includes a standard buffer spring and a heavy-duty five-coil bolt extractor spring designed specifically for the AR-15 platform. The buffer spring helps regulate the cycling of the action, contributing to reliable function and improved recoil management, while the bolt extractor spring enhances the extraction process, ensuring spent casings are ejected smoothly. This spring kit is frequently utilized in mid-length gas system builds chambered in 5.56 NATO, making it a solid choice for those looking to enhance the performance and reliability of their AR-15.
Based on build data

Strike Industries AR-10 Shift Pins, Black - SI-AR10-SHIFT-BK

Law Tactical AR Folding Stock Adapter Gen 3 - HK

Fortis Lightweight Enhanced AR-15 End Plate, Gold - LE-BLK-K1-GOLD

Aero Precision Stripped M4e1 Ar-15 Lower Receiver - Special Edition - Freedom
Lower Receiver
Bravo Company Manufacturing Mk2 Recoil Mitigation System - Mod 1 - T2

B5 Systems Trigger Guard ATG-001-01
Aggregated and anonymized data showing how builders use this product
| Product | Category | Times Built Together |
|---|---|---|
| Strike Industries AR-10 Shift Pins, Black - SI-AR10-SHIFT-BK | 7 | |
| Law Tactical AR Folding Stock Adapter Gen 3 - HK | 6 | |
| Fortis Lightweight Enhanced AR-15 End Plate, Gold - LE-BLK-K1-GOLD | 6 | |
| Aero Precision Stripped M4e1 Ar-15 Lower Receiver - Special Edition - Freedom | Lower Receiver | 5 |
| Bravo Company Manufacturing Mk2 Recoil Mitigation System - Mod 1 - T2 | 5 | |
| B5 Systems Trigger Guard ATG-001-01 | 5 |
| Platform | Percentage |
|---|---|
| AR-15 | 61.5% |
| AR-10 | 38.5% |
| Caliber | Percentage |
|---|---|
| 300 Blackout | 40% |
| 5.56 NATO | 40% |
| .223 Wylde | 20% |
| Gas System | Percentage |
|---|---|
| Mid-Length | 40% |
| Pistol | 40% |
| Carbine | 20% |
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