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Lewis Machine & Tool
Overview
The LMT Piston Full Auto 5.56 AR-15 Bolt Carrier Group features an M16-style bolt carrier designed for reliable operation in piston-driven systems. This BCG is compatible with the 5.56 NATO caliber, making it suitable for various applications, including tactical and competitive shooting. It is often found in builds utilizing a mid-length gas system, providing a balance of reliability and reduced recoil for enhanced shooting performance.
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Builders on GunPartPicker first added the LMT Piston Full Auto 5.56 AR-15 Bolt Carrier Group to a build in February 2026. Builds with this bolt carrier group are mostly chambered in 5.56 NATO (77%, then .223 Wylde 13%), split between mid-length (44%) and carbine-length (30%) gas systems, and mostly AR-15 (89%, then AR-10 11%).
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Aggregated and anonymized data showing how builders use this product
Builds in the community that include the Lmt Piston Full Auto 5.56 Ar-15 Bolt Carrier Group
| Build | Parts | Total |
|---|---|---|
![]() | 12 | $3186.69 |
![]() | 11 | $989.04 |
![]() | 18 | $2454.01 |
![]() | 8 | $1188.90 |
![]() | 18 | $794.05 |
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ran 1000 rounds zero malfunctions