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Sprinco USA
Overview
The Sprinco USA XP Buffer Spring Kit includes an XP buffer spring and a dual extractor spring set specifically designed for the AR-15 platform. The XP designation indicates a higher power spring, which enhances the cycling speed of the action, making it ideal for builds that require reliable operation under varied conditions. This kit is often found in mid-length gas system builds chambered in 5.56 NATO, where optimal performance and reliability are crucial.
Based on build data

Law Tactical AR Folding Stock Adapter Gen 3 - HK
Stock Adapter
V Seven Weapon Systems Ar-15 Ultra-Light Magazine Catch Blk Diamonds
Magazine Release
Wmd Guns Nitromet Ar-15 Bolt Catch
Bolt Catch
Zro Delta Ar-15 Selector Mil-Spec
Safety
Yankee Hill Machine Co., Inc. Ar-15 Gas Tube Black Rifle
Gas Tube
Wmd Guns 5.56 Ar-15 Bolt Carrier Group Without Hammer - NiB-X Finish - Black
Bolt Carrier GroupAggregated and anonymized data showing how builders use this product
| Product | Category | Times Built Together |
|---|---|---|
| Law Tactical AR Folding Stock Adapter Gen 3 - HK | Stock Adapter | 8 |
| V Seven Weapon Systems Ar-15 Ultra-Light Magazine Catch Blk Diamonds | Magazine Release | 7 |
| Wmd Guns Nitromet Ar-15 Bolt Catch | Bolt Catch | 7 |
| Zro Delta Ar-15 Selector Mil-Spec | Safety | 7 |
| Yankee Hill Machine Co., Inc. Ar-15 Gas Tube Black Rifle | Gas Tube | 6 |
| Wmd Guns 5.56 Ar-15 Bolt Carrier Group Without Hammer - NiB-X Finish - Black | Bolt Carrier Group | 6 |
| Platform | Percentage |
|---|---|
| AR-15 | 81.8% |
| AR-10 | 13.6% |
| AR-9 | 4.5% |
| Caliber | Percentage |
|---|---|
| 5.56 NATO | 81% |
| .223 Wylde | 9.5% |
| .308 Win | 4.8% |
| 9mm | 4.8% |
| Gas System | Percentage |
|---|---|
| Carbine | 45% |
| Mid-Length | 30% |
| Rifle | 15% |
| Blowback | 5% |
| Pistol | 5% |
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