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
Available Merchants(6)
Prices checked
Price Alert
Build history on GunPartPicker
Builders have added the CMMG AR-15 Buffer Retainer Sping to their builds on GunPartPicker. Since April 2026, it ranks #55 of the 116 buffer springs builders have added. Builds with this buffer spring are split between .223 Wylde (33%) and 5.56 NATO (33%), mostly on mid-length gas (60%, then blowback 20%), and mostly AR-15 (82%, then AR-9 18%).
Availability is good: it was in stock at one retailer or another nearly every time we checked in October 2026, and today 5 of the 6 retailers we track have it in stock. It dipped to $1.79 at Palmetto State Armory for a stretch in October 2026, under its usual $1.86, so sales do come around. Buying today, the lowest price is $1.62 at KY Gun Company, which matches the best price we saw in October.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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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 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
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 Buffer Retainer Sping
| Build | Parts | Total |
|---|---|---|
 | 25 | $541.70 |
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