CMMG AR-15 Carbine Action Buffer Spring - 55CA9A2
Click to see full view
CMMG
Overview
The CMMG AR-15 Carbine Action Buffer Spring is designed specifically for carbine-length systems, providing the necessary tension to ensure reliable cycling of the action. Made from steel, this buffer spring contributes to the overall durability and performance of your AR-15 build. It is commonly found in builds utilizing a mid-length gas system chambered in 5.56 NATO, making it a solid choice for those configurations.
Specifications
August 2026 on GunPartPicker
CMMG AR-15 Carbine Action Buffer Spring - 55CA9A2 ranked #14 of the 58 buffer springs builders added on GunPartPicker in August 2026. Builders have been adding it to their builds on GunPartPicker since February 2026. All time, it ranks #17 of the 97 buffer springs builders have added. Builds with this buffer spring are nearly all chambered in 5.56 NATO, nearly all on mid-length gas, and nearly all AR-15.
Availability is good: it was in stock at one retailer or another nearly every day in August 2026, and today 6 of the 8 retailers we track have it in stock. The best price crept up from $4.98 to $5.69 over August 2026. Buying today, the lowest price is $4.98 at Classic Firearms, which matches the best price we saw in August.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 35 retailers
Not sure which buffer spring to pick?
We ranked every buffer spring by how often it shows up in real builds on GunPartPicker.
Read the guide: AR-15 Buffer Spring Guide →Check it against the live catalog:
Frequently Built With
The part most often added in each category by the 23 builds that include this one
Bravo Company AR-15/M16 BCM Mil-Spec 6 Position Receiver Extension
CMMG AR-15 Carbine Buffer Assembly - 55CA977
CMMG AR-15 HD Pivot and Takedown Pin Parts KIT - 55AFF3B
Rise Armament AR-15 Magazine Release Button - Rise Red
Phase 5 Tactical Extended Ambidextrous Bolt Release V3 - Red Cerakote
Aero Precision Stripped M4E1 AR-15 Lower Receiver - Special Edition - Freedom
Builds Featuring This Part
See all 3 →Builds in the community that include the CMMG AR-15 Carbine Action Buffer Spring - 55CA9A2
| Build | Parts | Total |
|---|---|---|
 | 20 | $1836.69 |
 | 19 | $1491.77 |
 | 28 | $2221.62 |
No reviews yet. Be the first to review this product!