J
Jando_pdwminor gripes
Reviewed on April 17, 2026Verified with Build
works as expected. price is a little steep
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LMT MARS-L Ambidextrous AR-15 Stripped Lower Receiver
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Lewis Machine & Tool
Overview
The LMT Mars-L Ambidextrous AR-15 Stripped Lower Receiver is designed for builders looking to create a versatile platform, featuring ambidextrous controls that facilitate operation for both right and left-handed users. This stripped lower is compatible with standard AR-15 components and has a trigger pin diameter of .154, ensuring compatibility with a wide range of trigger assemblies. Builders often integrate this receiver into mid-length gas system builds chambered in 5.56 NATO, making it a solid choice for those aiming for a balance of accuracy and reliability.
Specifications
MPNM7SL
ControlsAmbidextrous
Trigger Pin.154
FinishHardcoat Anodized
AssemblyStripped
PlatformAR-15
August 2026 on GunPartPicker
LMT MARS-L Ambidextrous AR-15 Stripped Lower Receiver was the seventh most added lower receiver on GunPartPicker in August 2026, behind the Aero Precision M4E1 Stripped AR-15 Lower Receiver - FDE Cerakote, with about 3% of all lower receivers added to builds. Down from #6 in July. Builds with this lower receiver are mostly chambered in 5.56 NATO (91%, then .223 Wylde 9%), mostly on mid-length gas (63%, then carbine-length 29%), and nearly all AR-15.
It was in stock most days in August 2026, and today 2 of the 4 retailers we track have it in stock. It dipped to $320.99 at KY Gun Company for a stretch in August 2026, under its usual $352.35, so sales do come around. Buying today, the lowest price is $342 at BattleHawk Armory, above August's low of $320.99, so a better deal may come back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 31 retailers
Not sure which lower receiver to pick?
We ranked every lower receiver by how often it shows up in real builds on GunPartPicker.
Read the guide: AR-15 Lower Receiver Trends →Frequently Built With
The part most often added in each category by the 621 builds that include this one
Geissele Automatics AR-15 SSA-E X Lightning Bow Trigger
Trigger$335in 139 builds
Wilson Combat AR-15 Starburst Gunfighter Pistol Grip Black
Pistol Grip$25in 54 builds
LMT Upper Receiver Assembly - AR-15 - M4 - Black Anodize
Upper Receiver$212in 39 builds
CMMG AR-15 HD Pivot and Takedown Pin Parts KIT - 55AFF3B
Takedown Pin$16in 76 builds
B5 Systems Trigger Guard ATG-001-01
Trigger Guard$12in 85 builds
Phase 5 Tactical AR-15 90 Degree Ambi Safety Selector Black
Safety$45in 44 builds
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.
90.6%
5.56 NATO90.6%
.223 Wylde9.4%
Gas SystemBased on real build data showing which gas system lengths builders use with this product.
62.5%
Mid-Length62.5%
Carbine29.2%
Rifle8.3%
Builds Featuring This Part
See all 25 →Builds in the community that include the Lmt Mars-L Ambidextrous Ar-15 Stripped Lower Receiver
| Build | Parts | Total |
|---|---|---|
 | 27 | $6436.41 |
 | 16 | $1833.70 |
 | 21 | $3095.67 |
 | 27 | $2136.77 |
 | 28 | $2665.78 |
 | 21 | $3625.33 |
| 12 | $3720.39 |
 | 25 | $3599.68 |
 | 22 | $5949.16 |
 | 8 | $1550.54 |
 | 24 | $6455.04 |
 | 12 | $2328.10 |
Customer reviews
4.3out of 5
3 global ratings
Top reviews
Z
ZaccaiahLMT MARS-L tight fit
Reviewed on March 27, 2026Verified with Build
LMT MARS-L ambi stripped lower mates with any quality upper with zero detectable play at the takedown pin lugs. Ambi controls cut into the receiver. Black anodize is consistent. Premium lower that lives up to the LMT reputation.
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P
PatchMe556LMT MARS-L anodize batch
Reviewed on January 31, 2026Verified with Build
LMT MARS-L ambi lower quality is excellent. Mate to any quality upper has zero play. The black anodize varies slightly between production batches - mine matches a recent run but a side by side with an older LMT lower shows tone differences.
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