CARBINE K STOCK SYSTEM
September 14, 2026
QUANTUM 22K
September 17, 2026
CARBINE K RECEIVER EXTENSION KIT
Price range: $99.95 through $232.95
CARBINE K RECEIVER EXTENSION KIT
Go shorter without giving up the familiar fit and adjustability of a carbine stock.
The Maxim Defense Carbine K Buffer Tube Kit is built around a compact 6-inch buffer tube, shortening the rear of the platform compared to a standard carbine receiver extension. By shifting the stock’s adjustment range forward, the Carbine K creates a shorter overall package and reduced length of pull–ideal for compact builds and shooters who prefer a tighter, more maneuverable setup.
The system combines the 6-inch Carbine K Buffer Tube with your choice of compatible buffer configuration, allowing the system to be tailored to the firearm rather than relying on a one-size-fits-all buffer setup.
The kit also includes a MIL-SPEC castle nut and receiver latch plate and is compatible with compact stock options including the Magpul MOE SL-M, B5 Systems Sierra K and LWRC UCIW.
Compact where it counts. Configurable where it matters.
FEATURES
- 9 Buffer Options
- 6.06" Overall Length
- MIL-SPEC Castle Nut
- MIL-SPEC Receiver Latch Plate
- Compatible With:
- Magpul MOE SL-M
- B5 Systems – Serra K Stock
- LWRC – UCIW Stock
SPECS |
|
| Overall Length | 6" |
| Outer Diameter | 1.15" |
| Inner Diameter | 1" |
| Thread Pitch | 1 3/16-16 UN-2A |
| Material | 7075-T6 Aluminum |
| Finish | Anodized |
| Color | Black |
| Ships With | End Plate & Castle Nut |
| Buffer Option | Overall Kit Weight | |
|---|---|---|
| Maxim CQB Buffer & Spring | STD | 15.6 oz |
| H1 | 16.3 oz | |
| H2 | 16.9 oz | |
| H3 | 17.2 oz | |
| Pistol | 19.8 oz | |
| Roller Delay Blowback System | 17.8 oz | |
| JP Silent Capture Spring | STD | 16.1 oz |
| Heavy | 17.0 oz | |
| 9MM | 20.4 oz | |
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.
Go shorter without giving up the familiar fit and adjustability of a carbine stock.
The Maxim Defense Carbine K Buffer Tube Kit is built around a compact 6-inch buffer tube, shortening the rear of the platform compared to a standard carbine receiver extension. By shifting the stock’s adjustment range forward, the Carbine K creates a shorter overall package and reduced length of pull–ideal for compact builds and shooters who prefer a tighter, more maneuverable setup.
The system combines the 6-inch Carbine K Buffer Tube with your choice of compatible buffer configuration, allowing the system to be tailored to the firearm rather than relying on a one-size-fits-all buffer setup.
The kit also includes a MIL-SPEC castle nut and receiver latch plate and is compatible with compact stock options including the Magpul MOE SL-M, B5 Systems Sierra K and LWRC UCIW.
Compact where it counts. Configurable where it matters.
| Color | Black |
|---|---|
| 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, CQB Roller Delayed Blowback System (RDB) |
| Material Composition | 7075-T6 Aluminum |
| Finish | Anodized |
| Overall Length | 6 in |
| Outer Diameter | 1.15 in |
| Thread Pitch | 1 3/16-16 UN-2A |
| Ships With | End Plate, Castle Nut |
| Inner Diameter | 1 in |
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