Lower Receivers
Build or upgrade your custom rifle with our selection of lower receivers at Boss Firearms. Explore stripped lowers, complete lower receiver assemblies, and tactical firearm parts from top manufacturers.
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Out of stock
LMT Defense - Flat Top Upper Receiver - Defender-L 5.56 Lower Receiver Stripped - #L7D1A-LMP149H-COMBO
LMT Defense
$423.00Get your LMT L7D1A upper receiver and LMT LMP149H lower receiver combo for your AR15 build ordered today! UPPER RECEIVER The LMT Defense standard flat-top AR15 upper receiver features mil-spec...$423.00 -
Out of stock
LWRC Enhanced Lower Receiver #ICL5B + (5) Free Magpul PMAG Magazines - #ICL5B-MAG-BUN
LWRC
$773.75LWRC M6 IC Enhanced Lower Receiver is fully ambidextrous, with a safety selector, mag release and bolt stop. These are semi auto receivers are stamped with 5.56 full auto markings.The LWRC M6 IC...$773.75 -
Out of stock
BCM - Lower Receiver Group w/MK2RMS-M1T & Stock Mod-0 Blk - #LRG-RMS-STK-MOD-0-BLK
BCM
$494.00Bravo Company introduces the BCMGUNFIGHTER™ Stock. The strongest light-weight polymer stock available for your mil-spec receiver extension is here! Snag free Design. No sharp edges prevent tangling...$494.00 -
Out of stock
BCM - Lower Receiver w/MK2RMS-M1T0 & Stock Mod-1-SOPMOD Blk - #LRG-RMS-STK-MOD-1-SPMD-BLK
BCM
$469.00BCMGUNFIGHTER™ Stock Assembly - Mod 1 - SOPMOD (Widebody) Compartment. Strong and Lightweight for your mil-spec receiver extension. More pronounced cheekweld (SOPMOD type) Snag free Design. No sharp...$469.00 -
Out of stock
BCM - Complete Widebody Lower Receiver w/MOD-2-SOPMOD Stock - #LRG-STK-MOD-2-SPMD-BLK
BCM
$535.00SPECIFICATIONS: Caliber: MULTI Model: BCM4 Stock: BCM Mod 2 SOPMOD Fire Control: PNT Semi Auto Rear Sling Mounts: QTY 3 Receiver Extension: 7075 T6 Mil-Spec Diameter Buffer Type: Carbine H Pistol...$535.00 -
Out of stockOn Sale
LMT Defense - AR-10 Lower MARS-H Complete w/ EU Trigger - #LM308AM-EU
LMT Defense
Now: $1,323.00Was: $1,349.00The MARS-H integrates the cutting-edge design of the MARS-L into the MWS® platform, delivering enhanced functionality and versatility. TheNow: $1,323.00Was: $1,349.00 -
Out of stock
Sig Sauer - #PMCX-762R-11B-LT-B-LOWER
Sig Sauer
$1,000.00This is a new Sig Sauer PMCX complete lower receiver. It features lightweight aluminum construction with a blackfinish, ambidextrous safety selector, flat blade match trigger, polymer grip, and a...$1,000.00 -
Out of stock
Sig Sauer - #RMCX-16B-IR-Lower
Sig Sauer
$1,200.00This is a new Sig Sauer MCX SPEAR-LT complete lower receiver. It features lightweight aluminum construction with a Coyote finish, ambidextrous safety selector, flat blade match trigger, polymer...$1,200.00 -
Out of stock
Sig Sauer - #PMCX-762R-11B-LT-Lower
Sig Sauer
$1,100.00The Sig Sauer PMCX Spear-LT Lower features a fully ambidextrous bolt catch and release, coyote anodized finish, minimalist stock and AR-15 style trigger compatibility. These lowers are compatible...$1,100.00 -
Out of stock
BCM - Complete Widebody Lower Receiver w/MOD-2-SOPMOD Stock - FDE #LRG-STK-MOD-2-SPMD-FDE
BCM
$409.99The Bravo Company Manufacturing Complete AR-15 Lower Receiver is built to Mil-Spec ensuring compatibility with a wide range of parts and accessories. This AR-15 lower comes fully assembled and ready...$409.99 -
LWRC - Enhanced Lower Receiver - Black - ICEL5B
LWRC
$699.99LWRC M6 IC Enhanced Lower Receiver is fully ambidextrous, with a safety selector, mag release and bolt stop. These are semi auto receivers are stamped with 5.56 full auto markings.The LWRC M6 IC...$699.99 -
Out of stock
Sig Sauer - MCX SPEAR-LT Complete Lower #MCX-Lower
Sig Sauer
$1,250.00The Sig Sauer MCX Spear-LT Lower features a fully ambidextrous controls and rear QD point for slings, 1913 3-slot Pic rail for attaching stock adapters. This lower includes the mimimalist stock,...$1,250.00