CMMG AR-15 Lower Springs and Pins KIT - 55AFF75
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CMMG
Overview
The CMMG AR-15 Lower Springs and Pins Kit includes essential components designed to ensure a smooth and reliable operation of your AR-15 platform. This kit is crucial for the proper functioning of the lower receiver, helping to maintain the action of the trigger and hammer while providing stability during firing. This product is commonly found in builds featuring a carbine gas system and chambered in 5.56 NATO, making it a staple for many standard AR-15 configurations.
Specifications
August 2026 on GunPartPicker
CMMG AR-15 Lower Springs and Pins KIT - 55AFF75 ranked #18 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 is the eighth most added buffer spring on the site. Builds with this buffer spring are nearly all chambered in 5.56 NATO, nearly all on mid-length gas, and split between AR-10 (50%) and AR-15 (50%).
Availability is good: it was in stock at one retailer or another nearly every day in August 2026, and today all 9 retailers we track have it in stock. It dipped to $9.78 at KY Gun Company for a stretch in August 2026, well under its usual $12.39 to $12.49, so sales do come around. Buying today, the lowest price is $10.47 at KY Gun Company, above August's low of $9.78, so a better deal may come back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 31 retailers
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Read the guide: AR-15 Buffer Spring Guide →Frequently Built With
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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.
Builds Featuring This Part
See all 1 →Builds in the community that include the CMMG AR-15 Lower Springs and Pins Kit - 55AFF75
| Build | Parts | Total |
|---|---|---|
 | 33 | $2806.91 |
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