PDX™ – SBR | 5.56 NATO
September 8, 2026
CARBINE K RECEIVER EXTENSION KIT
September 14, 2026
CARBINE K STOCK SYSTEM
Price range: $149.95 through $282.95
CARBINE K STOCK SYSTEM
Get the complete Carbine K System in one compact package.
At the heart of the kit is Maxim Defense's 6-inch Carbine K Buffer Tube, designed to shorten the rear of the platform compared to a standard carbine receiver extension. The shorter tube shifts the stock's adjustment range forward, reducing overall length and length of pull while maintaining the versatility of an adjustable stock.
The system pairs the Carbine K Buffer Tube with your choice of 9 compatible buffer configurations, allowing the system to be tailored to the firearm.
A MIL-SPEC castle nut, receiver latch plate and Magpul MOE SL-M Stock (available in black & FDE) complete the kit, providing everything needed for a compact Carbine K stock and buffer system in one package.
FEATURES
- MIL-SPEC Castle Nut
- MIL-SPEC Receiver Latch Plate
NOTES
- Kit also available without stock.
SPECS |
|
| Weight | 15.6 oz - 20.4 oz Based on Buffer Selection |
| Length Added | Collapsed: 6.25" Extended: 9.25" |
| Positions of Adjustment | 5 |
| Material | 7075-T6 Aluminum |
| Finish | Anodized |
| Color | Black / FDE |
| Buffer Options | Maxim Defense CQB Buffer & Spring: Standard / H1 / H2 / H3 / 9mm Roller Delayed Blowback System (RDB) JP Silent Capture Spring: Standard / Heavy / 9mm |
| Bolt Carrier Group | Any MILSPEC |
At Maxim Defense, we take pride in designing and manufacturing high-performance firearms, suppressors and accessories that deliver exceptional reliability and durability. Your feedback and positive reviews are important to us, as they help us continually improve our products. If you experience any issues with your Maxim Defense products, please contact us at info@maximdefense.com, and we’ll work with you to resolve the matter as quickly as possible. Please note that we do not cover damage caused by the installation of other manufacturers’ products.
Get the complete Carbine K System in one compact package.
At the heart of the kit is Maxim Defense’s 6-inch Carbine K Buffer Tube, designed to shorten the rear of the platform compared to a standard carbine receiver extension. The shorter tube shifts the stock’s adjustment range forward, reducing overall length and length of pull while maintaining the versatility of an adjustable stock.
The system pairs the Carbine K Buffer Tube with your choice of 9 compatible buffer configurations, allowing the system to be tailored to the firearm.
A MIL-SPEC castle nut, receiver latch plate and Magpul MOE SL-M Stock (available in black & FDE) complete the kit, providing everything needed for a compact Carbine K stock and buffer system in one package.
| Color | Black, FDE |
|---|---|
| Buffer System | JP Silent Captured Spring – 9mm, JP Silent Captured Spring – Heavy, JP Silent Captured Spring – Standard, Maxim Buffer & Spring – H1, Maxim Buffer & Spring – H2, Maxim Buffer & Spring – H3, Maxim Buffer & Spring – Pistol Caliber, Maxim Buffer & Spring – STD 3.3oz, Roller Delayed Blowback System (RDB) |
| Positions of Adjustment | 5 |
| Finish | Anodized |
| Bolt Carrier Group | Any MILSPEC |
| Collapsed Length | 6.25 in |
| Material Composition | 7075-T6 Aluminum |
| Extended Length | 9.25 in |
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