Key Arma Alpha FSM1 Buttstock: Com-Spec Polymer Stock for AR and AK Platforms
If your buffer tube is com-spec rather than mil-spec, your stock options shrink considerably. Most aftermarket buttstocks target the mil-spec diameter, leaving com-spec owners either forcing a loose fit or sticking with whatever came on the rifle. The Key Arma Alpha FSM1 is purpose-built for com-spec buffer tubes, so it seats properly without wobble or shimming.
The entire stock is moulded from impact-resistant polymer that weighs just 171 grams. That minimal weight keeps the rear of the rifle balanced without adding a tail-heavy feel that drags your muzzle upward. Polymer also stays comfortable against the face and shoulder across temperature swings, avoiding the cold-bite of metal stocks on winter mornings or the heat soak that aluminium picks up after sitting in direct sunlight on a range bench.
The profile is deliberately stripped back. A slim butt pad and compact overall footprint mean less material to snag when shouldering quickly, transitioning between targets, or working around obstacles. Shooters running chest rigs, body armour, or heavy jackets will appreciate how cleanly the FSM1 tucks into the shoulder pocket without the bulk that wider stocks introduce.
Sling users get a QD (quick-detach) mount point positioned at the rear of the stock, close to the buffer tube adjustment lever. That rear-centre placement provides a natural hang angle on both single-point and two-point sling configurations and keeps the attachment accessible without having to rotate the rifle to find it.
Fitting the FSM1 requires no tools whatsoever. Depress the buffer tube lever, slide the existing stock off, slide the FSM1 into position, and set your preferred length of pull. The whole process takes less time than loading a magazine.
Specifications
| Model |
Key Arma Alpha FSM1 |
| Compatibility |
AR / AK com-spec buffer tubes |
| Dimension |
Com-Spec |
| Material |
Polymer |
| Weight |
0.171 kg |
| Sling Mount |
QD point (rear, near adjustment button) |
| Installation |
Tool-free slide-on |
The right stock for com-spec builds that need to stay light, compact, and functional. Buy the Key Arma Alpha FSM1 buttstock online at NeonSales, delivered across South Africa.