CMMG AR-15 A1 Receiver Extension
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CMMG
Overview
The CMMG AR-15 A1 Receiver Extension is an aluminum buffer tube designed specifically for A1 configurations, making it a straightforward choice for builders looking to maintain a classic aesthetic while ensuring reliable function. This tube is compatible with rifle-length gas systems and is finished in black for a sleek look. It's commonly found in builds chambered in .308 Win, where the A1 style helps achieve a traditional look while accommodating the necessary components for optimal performance.
Specifications
August 2026 on GunPartPicker
CMMG AR-15 A1 Receiver Extension ranked #33 of the 48 buffer tubes builders added on GunPartPicker in August 2026. Builders have been adding it to their builds on GunPartPicker since March 2026. All time, it ranks #44 of the 63 buffer tubes builders have added.
Availability is good: it was in stock at one retailer or another nearly every day in August 2026, and today 6 of the 7 retailers we track have it in stock. It dipped to $32.75 at Brownells for a stretch in August 2026, well under its usual $40.35 to $43.08, so sales do come around. Buying today, the lowest price is $40.35 at Classic Firearms, above August's low of $32.75, 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 7 builds that include this one
LMT MWS .308 Stripped Lower Receiver
Geissele Automatics AR-15 SSA-E X Lightning Bow Trigger
Brownells A2 Buttstock, OD Green
Aero Precision AR-15 Rifle Buffer
Ergo Grips Ergo Ambidextrous Suregrip Polymer Textured Black
CMMG AR15 Ambi Mag Catch, Black - 55AFF6E
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.
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