CMMG AR-15 Buffer Retainer Sping
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CMMG
Overview
The CMMG AR-15 Buffer Retainer Spring is a critical component designed to securely hold the buffer in place within the receiver extension. This spring is specifically made for AR-15 platforms, ensuring reliable function during operation. It's commonly found in builds featuring a carbine gas system and is particularly favored in 300 Blackout configurations, where precise cycling is essential for optimal performance.
Specifications
August 2026 on GunPartPicker
CMMG AR-15 Buffer Retainer Sping ranked #29 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 #47 of the 96 buffer springs builders have added. Builds with this buffer spring are split between 300 Blackout (50%) and 5.56 NATO (50%), split between carbine-length (50%) and mid-length (50%) gas systems, and nearly all AR-15.
Availability is good: it was in stock at one retailer or another nearly every day in August 2026, but today 2 of the 5 retailers we track have it in stock. It dipped to $1.63 at Brownells for a stretch in August 2026, well under its usual $1.86 to $6.99, so sales do come around. Buying today, the lowest price is $1.86 at Brownells, above August's low of $1.63, so a better deal may come back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 35 retailers
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Frequently Built With
The part most often added in each category by the 10 builds that include this one
Expo Arms AR-15 Carbine Buffer With Red Bumper
LBE Unlimited AR-15 Mil-Spec Fire Control Group, Black - ARTRGRP
Wilson Combat Wc-15 Billet Lower Receiver
LBE Unlimited AR-15 A2 Pistol Grip, Black - ARGRP
Rise Armament AR-15 Magazine Release Button - Rise Red
LBE Unlimited AR-15 Bolt Catch Assembly, Black - ARBCASY
Build Configuration Breakdown
Aggregated and anonymized data showing how builders use 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 1 →Builds in the community that include the Cmmg Ar-15 Buffer Retainer Sping
| Build | Parts | Total |
|---|---|---|
 | 25 | $840.78 |
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