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
LMT Defense Semi Auto 5.56 NATO Complete Bolt Carrier Group
Available Merchants(4)
Prices checked
Price Alert
October 2026 on GunPartPicker
LMT Defense Semi Auto 5.56 NATO Complete Bolt Carrier Group ranked #98 of the 258 bolt carrier groups builders added on GunPartPicker in October 2026. Builders have added it to their builds on GunPartPicker. Since April 2026, it ranks #64 of the 552 bolt carrier groups builders have added. Builds with this bolt carrier group are nearly all chambered in 5.56 NATO, split between mid-length (43%) and carbine-length (27%) gas systems, and nearly all AR-15.
Availability is good: it was in stock at one retailer or another nearly every time we checked in October 2026, and today 2 of the 4 retailers we track have it in stock. Prices barely moved in October 2026, holding around $249.75, with no real sale all month. Buying today, the lowest price is $249.75 at Brownells, which matches the best price we saw in October.
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Frequently Built With
The part most often added in each category by the builds that include this one
Breek Arms AR-15 Warhammer MOD2 Ambidextrous Charging Handle Black
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"
Geissele Automatics AR-15 SSA-E X Lightning Bow Trigger
Mdt Skeleton Carbine Stock With Cheek Riser 9.75in Black
Magpul AFG-2 Angled Fore Grip - 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 builds →Builds in the community that include the Lmt Defense Semi Auto 5.56 Nato Complete Bolt Carrier Group
| Build | Parts | Total |
|---|---|---|
 | 9 | $1078.40 |
 | 13 | $2178.70 |
 | 17 | $1067.63 |
 | 17 | $4149.93 |
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