Mk3 AR-15 Action Spring
$8.49 at OpticsPlanet · 3 stores
In stock
Best price
$8.49at OpticsPlanet
In stock Sale checked Oct 1, 2026
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| OpticsPlanet Best price | $8.49Salechecked Oct 1, 2026 | In stock | Buy at OpticsPlanet | |
| CMMG | $5.95checked Oct 1, 2026 | Check store | Buy at CMMG | |
| Brownells | $5.69checked Oct 1, 2026 | Out of stock | Buy at Brownells |
Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.
Price history
Lowest in-stock price in the last 30 days: $8.49 at OpticsPlanet. Dashed line = out of stock. Tracking since Sep 28, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| Brownells | $5.69 | $5.69 | $5.69 |
| CMMG | $5.95 | $5.95 | $5.95 |
| OpticsPlanet | $8.49 | $8.49 | $8.49 |
Since Sep 28, 2026.
About this part
The AR .308 Mk3 Carbine Action Spring is an AR-10 buffer part from CMMG. It's sold by 3 stores (1 in stock), from $5.69 to $8.49. The lowest in-stock price in the last 30 days was $8.49 at OpticsPlanet.
Fits and works with
- Buffer system
- Carbine · Buffers and springs
Specifications
- Manufacturer
- CMMG
- Type
- Spring
- Platform
- AR-10
From the manufacturer
Replacement AR .308 MK 3 Carbine Action Spring. Mfg: Cmmg
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