CMMG AR-15 Carbine Buffer Assembly - 55CA977
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CMMG
Overview
The CMMG AR-15 Carbine Buffer Assembly is a crucial component of your AR-15 build, designed to work with Mil-Spec buffer tubes and optimized for carbine configurations. This assembly ensures smooth cycling and reliable operation by providing the necessary weight and recoil management for your firearm. It is commonly found in builds that utilize a mid-length gas system and chambered in 5.56 NATO, making it a solid choice for a variety of applications.
Specifications
Available Merchants(8)
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Price Alert
October 2026 so far on GunPartPicker
CMMG AR-15 Carbine Buffer Assembly - 55CA977 is the third most added buffer on GunPartPicker so far in October 2026, behind the Spike's Tactical Spikes Tactical T3 Tungsten Buffer, Black - SLA00T3, with about 14% of all buffers added to builds. Down from #2 in May, June, July, August and September. Builds with this buffer are mostly chambered in 5.56 NATO (79%, then .223 Wylde 8%), split between mid-length (54%) and carbine-length (28%) gas systems, and nearly all AR-15.
Availability is good: it was in stock at one retailer or another nearly every day in September 2026, and today 5 of the 8 retailers we track have it in stock. It dipped to $19.99 at Sportsman's Guide for a stretch in September 2026, well under its usual $22.99, so sales do come around. Buying today, the lowest price is $19.99 at Sportsman's Guide, which matches the best price we saw in September.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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Frequently Built With
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CMMG AR-15 HD Pivot and Takedown Pin Parts KIT - 55AFF3B
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Rise Armament AR-15 Magazine Release Button - Rise Red
Wilson Combat AR-15 Starburst Gunfighter Pistol Grip Black
Build Configuration Breakdown
Aggregated and anonymized data showing how builders use this product
PlatformBased on real build data showing which platform (AR-15, AR-10, AR-9) builders pair with this product.
CaliberBased on real build data showing which calibers builders choose alongside this product.
Gas SystemBased on real build data showing which gas system lengths builders use with this product.
Builds Featuring This Part
See all builds →Builds in the community that include the CMMG AR-15 Carbine Buffer Assembly - 55CA977
| Build | Parts | Total |
|---|---|---|
 | 23 | $2881.67 |
 | 15 | $1360.72 |
 | 28 | $3969.75 |
 | 31 | $7690.64 |
 | 29 | $1877.94 |
 | 22 | $3045.81 |
| 17 | $954.40 |
 | 35 | $3442.78 |
| 26 | $2046.34 |
 | 26 | $1628.97 |
 | 19 | $674.71 |
 | 27 | $936.44 |
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