LMT Defense Semi Auto 5.56 NATO Complete Bolt Carrier Group
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Lewis Machine & Tool
Overview
The LMT Defense Semi Auto 5.56 NATO Complete Bolt Carrier Group is designed specifically for the AR-15 platform, providing a reliable and efficient cycling mechanism for your firearm. It features a fully assembled BCG that ensures compatibility with 5.56 NATO ammunition, facilitating smooth operation and enhanced reliability in various shooting conditions. This bolt carrier group is commonly found in mid-length gas system builds, making it a go-to choice for those looking to optimize their AR-15 performance.
Specifications
August 2026 on GunPartPicker
LMT Defense Semi Auto 5.56 NATO Complete Bolt Carrier Group ranked #123 of the 229 bolt carrier groups builders added on GunPartPicker in August 2026. Builders have been adding it to their builds on GunPartPicker since February 2026. All time, it ranks #63 of the 444 bolt carrier groups builders have added. Builds with this bolt carrier group are mostly chambered in 5.56 NATO (86%, then .223 Wylde 14%), split between mid-length (50%) and carbine-length (17%) gas systems, and nearly all AR-15.
It was hard to find in August 2026, in stock on only 7 of the 15 days we checked, and today 3 of the 4 retailers we track have it in stock. It dipped to $224.10 at Brownells for a stretch in August 2026, well under its usual $249.75, so sales do come around. Buying today, the lowest price is $242.10 at Palmetto State Armory, above August's low of $224.10, so a better deal may come back.
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Frequently Built With
The part most often added in each category by the 32 builds that include this one
Radian Weapons AR-15 Raptor/talon L/s Combo Black Anodized
LMT MARS-L Ambidextrous AR-15 Stripped Lower Receiver
Aero Precision M4E1 Threaded Barreled AR-15 Upper Receiver 5.56 Mid-Length - Atlas S-One - 14.5"
Rise Armament Advanced Performance Trigger, Red - RA-535-RED-ARP
Magpul AFG-2 Angled Fore Grip - Black
Mdt Skeleton Carbine Stock With Cheek Riser 9.75in Black
Build Configuration Breakdown
Aggregated and anonymized data showing how builders use 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.
Builds Featuring This Part
See all 4 →Builds in the community that include the Lmt Defense Semi Auto 5.56 Nato Complete Bolt Carrier Group
| Build | Parts | Total |
|---|---|---|
 | 9 | $1062.75 |
 | 13 | $2160.81 |
 | 17 | $1073.19 |
 | 17 | $4140.32 |
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