Lewis Machine & Tool

LMT Piston Full Auto Bolt Carrier Group Gen 2 - 5.56

All Lewis Machine & Tool bolt carrier groups
Lewis Machine & Tool LMT Piston Full Auto Bolt Carrier Group Gen 2 - 5.56 - Bolt Carrier Group for AR-15 - view 1
Lewis Machine & Tool LMT Piston Full Auto Bolt Carrier Group Gen 2 - 5.56 - Bolt Carrier Group for AR-15 - view 2
Lewis Machine & Tool LMT Piston Full Auto Bolt Carrier Group Gen 2 - 5.56 - Bolt Carrier Group for AR-15 - view 3
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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

MPNL7D3CPE
Caliber5.56 NATO

Available Merchants(1)

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$425.70
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Build history on GunPartPicker

Builders have added the LMT Piston Full Auto Bolt Carrier Group Gen 2 - 5.56 to their builds on GunPartPicker. Since April 2026, it ranks #285 of the 552 bolt carrier groups builders have added.

It was out of stock everywhere we track every time we checked in October 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 builds that include this one

Forward Controls Design ACF AR-15 Ambidextrous Charging Handle

Forward Controls Design ACF AR-15 Ambidextrous Charging Handle

Charging Handle$114 · out of stockin 67% of them
LMT MARS-L Ambidextrous AR-15 Stripped Lower Receiver

LMT MARS-L Ambidextrous AR-15 Stripped Lower Receiver

Lower Receiver$342in 67% of them
Geissele Automatics Super Semi-Automatic Enhanced SSA-E Two Stage AR-15 Trigger .154"

Geissele Automatics Super Semi-Automatic Enhanced SSA-E Two Stage AR-15 Trigger .154"

Trigger$213in 33% of them
Sons of Liberty Gun Works Stripped Upper Receiver

Sons of Liberty Gun Works Stripped Upper Receiver

Upper Receiver$143 · out of stockin 33% of them
LMT Defense MRP 5.56mm 14.5" Piston Barrel

LMT Defense MRP 5.56mm 14.5" Piston Barrel

Barrel$717in 33% of them
Forward Controls Design GBF .750 Low Profile Gas Block - GBF

Forward Controls Design GBF .750 Low Profile Gas Block - GBF

Gas Block$62in 67% of them

Builds Featuring This Part

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Builds in the community that include the LMT Piston Full Auto Bolt Carrier Group Gen 2 - 5.56

BuildPartsTotal
LMT 14.5" build build
LMT 14.5" build		17$4064.98

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