LMT Piston Full Auto Bolt Carrier Group Gen 2 - 5.56
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Lewis Machine & Tool
Overview
The LMT Piston Full Auto Bolt Carrier Group Gen 2 is designed for the 5.56 NATO caliber, providing a reliable and robust option for builders looking to enhance the function of their AR-15 platform. This full auto-capable bolt carrier group features a piston system that improves reliability by reducing gas blowback and carbon fouling in the receiver, making it easier to maintain during extended shooting sessions. This component is commonly found in builds intended for competitive shooting or tactical applications, where reliability and performance are critical.
Specifications
August 2026 on GunPartPicker
LMT Piston Full Auto Bolt Carrier Group Gen 2 - 5.56 ranked #77 of the 229 bolt carrier groups builders added on GunPartPicker in August 2026. Builders have been adding it to their builds on GunPartPicker since April 2026. All time, it ranks #221 of the 445 bolt carrier groups builders have added.
It was out of stock everywhere we track for all of August 2026, and today the one retailer we track is out of stock. Listed prices start at $425.70 at Primary Arms for when it comes back.
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Frequently Built With
The part most often added in each category by the 3 builds that include this one
Forward Controls Design ACF AR-15 Ambidextrous Charging Handle
LMT MARS-L Ambidextrous AR-15 Stripped Lower Receiver
Geissele Automatics Super Semi-Automatic Enhanced SSA-E Two Stage AR-15 Trigger .154"
LMT Defense MRP 5.56mm 14.5" Piston Barrel
Sons of Liberty Gun Works Stripped Upper Receiver
Forward Controls Design GBF .750 Low Profile Gas Block - GBF
Builds Featuring This Part
See all 1 →Builds in the community that include the LMT Piston Full Auto Bolt Carrier Group Gen 2 - 5.56
| Build | Parts | Total |
|---|---|---|
 | 17 | $3983.07 |
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