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B5 Systems
Overview
The B5 Systems Car-15 Buttstock is a Mil-Spec polymer stock designed for carbine buffer tubes, offering a lightweight and durable solution for your AR-15 build. Its simple design provides a comfortable cheek weld and stability, making it ideal for quick target acquisition. This buttstock is often found in builds featuring a mid-length gas system chambered in 5.56 NATO, reflecting its adaptability for various shooting applications.
Based on build data

BLEM PSA AR15 Complete Classic Stealth Lower, Black
Lower Receiver
Strike Industries Extended Bolt Catch
Bolt Catch
Battle Arms Development Rack Ambidextrous Ar-15 Charging Handle - Mod C
Charging Handle
Magpul AFG-2 Angled Fore Grip - Black
Foregrip
Strike Industries AR-10 Shift Pins, Black - SI-AR10-SHIFT-BK
Takedown Pin
Law Tactical AR Folding Stock Adapter Gen 3 - HK
Stock AdapterAggregated and anonymized data showing how builders use this product
| Product | Category | Times Built Together |
|---|---|---|
| BLEM PSA AR15 Complete Classic Stealth Lower, Black | Lower Receiver | 106 |
| Strike Industries Extended Bolt Catch | Bolt Catch | 98 |
| Battle Arms Development Rack Ambidextrous Ar-15 Charging Handle - Mod C | Charging Handle | 86 |
| Magpul AFG-2 Angled Fore Grip - Black | Foregrip | 84 |
| Strike Industries AR-10 Shift Pins, Black - SI-AR10-SHIFT-BK | Takedown Pin | 80 |
| Law Tactical AR Folding Stock Adapter Gen 3 - HK | Stock Adapter | 77 |
| Platform | Percentage |
|---|---|
| AR-15 | 84.3% |
| AR-10 | 12.8% |
| AR-9 | 2.9% |
| Caliber | Percentage |
|---|---|
| 5.56 NATO | 69.1% |
| .223 Wylde | 12.1% |
| 300 Blackout | 6.9% |
| .308 Win | 4.1% |
| 9mm | 1.4% |
| 7.62x39mm | 1.3% |
| 6.5 Grendel | 1.3% |
| 6mm ARC | 1.1% |
| .450 Bushmaster | 0.9% |
| .458 SOCOM | 0.5% |
| .223 Remington | 0.3% |
| .204 Ruger | 0.2% |
| .22 ARC | 0.2% |
| .224 Valkyrie | 0.2% |
| .45 ACP | 0.2% |
| 6.5 Creedmoor | 0.2% |
| 7.62x51 NATO | 0.2% |
| Gas System | Percentage |
|---|---|
| Mid-Length | 48.4% |
| Carbine | 26.7% |
| Rifle | 14.4% |
| Pistol | 9.1% |
| Blowback | 1% |
| Proprietary | 0.2% |
| Intermediate | 0.2% |
Builds in the community that include the B5 Systems Car-15 Buttstock Mil-Spec Black
| Build | Parts | Total |
|---|---|---|
![]() | 22 | $1287.79 |
![]() | 20 | $930.39 |
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