Receivers & Frames
The foundation of your next custom build. Browse our selection of receivers and frames, including stripped lower receivers, forged/billet upper receivers, ambi controls, and serialized handgun frames to start your project legally and correctly.
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LMT Defense - MARS-L Stripped AR15 Lower Receiver - R-M7SL
LMT Defense
MSRP: $380.00$352.35The LMT Defense MARS-L Stripped AR15 Lower Receiver (R-M7SL) is the foundation of the legendary LMT MARS® system. The LMT® Modular Ambidextrous Rifle System (MARS®) lower receiver sets a new standard...MSRP: $380.00$352.35 -
LMT Defense - MRP-L Quad Rail 13.25" AR15 Upper Receiver - L7RA1A
LMT Defense
$940.50The LMT Defense MRP-L Quad Rail (Picatinny) 13.25" AR15 Upper Receiver (L7RA1A) features the patented LMT Monolithic Rail Platform (MRP™) — the upper receiver and handguard are machined from a single...$940.50 -
LMT Defense - MRP-L Quad Rail 9.25" AR15 Upper Receiver - L7S1A
LMT Defense
$890.10The LMT Defense MRP-L Quad Rail (Picatinny) 9.25" AR15 Upper Receiver (L7S1A) features the patented LMT Monolithic Rail Platform (MRP™) — the upper receiver and handguard are machined from a single...$890.10 -
LMT Defense - MRP-L MLOK 13.25" AR15 Upper Receiver - L7Y1A
LMT Defense
$940.50The LMT Defense MRP-L M-LOK 13.25" AR15 Upper Receiver (L7Y1A) features the patented LMT Monolithic Rail Platform (MRP™) — the upper receiver and handguard are machined from a single piece of forged...$940.50 -
LMT Defense - MRP-L MLOK 11.5" Specwar - AR15 Upper Receiver - L7Z1A
LMT Defense
$940.50The LMT Defense MRP-L M-LOK 11.5" AR15 Upper Receiver (L7Z1A) features the patented LMT Monolithic Rail Platform (MRP™) — the upper receiver and handguard are machined from a single piece of forged...$940.50 -
LMT Defense 16" MRP Piston Complete Upper Receiver Bundle BFCLMT-16
LMT Defense
$1,650.00The LMT Defense 5.56mm 16" Piston MRP Barrel Assembly (L7PC1B) is a 16-inch chrome lined 5.56×45 (.223) barrel featuring LMT's short-stroke piston operating system — the key upgrade for shooters who...$1,650.00 -
Out of stock
KAC Knights Armament Company KS-3 SR-15 5.56mm Upper Receiver Kit 11.5"121437
Knights Armament Company
$1,800.00Knight's Armament KS3 SR-15 E3.2 11.5" M-LOK Upper Receiver Group (P/N: 121437) delivers elite compact performance engineered with an 11.5-inch cold hammer-forged, chrome-lined barrel and a 1:7 twist...$1,800.00 -
Sons of Liberty Gunworks AR-15 Stripped Set Upper & Lower Receiver Set SCALPERSET-BLK
Sons of Liberty Gunworks
$289.75The Sons of Liberty Gun Works Scalper AR-15 Receiver Set features precision-machined 7075-T6 aluminum upper and lower receivers with a durable black anodized finish. Designed with Mil-Spec...$289.75 -
Ruger Mark IV Upper With Black Picatinny Rail 4.4" VCSCU-0135
Ruger
$50.00The Volquartsen Ruger MKIV Upper with Black Picatinny Rail is a precision-engineered replacement upper designed for compatible Ruger Mark IV pistols. Featuring a 4.4" threaded barrel with 1/2x28...$50.00 -
Out of stock
KAC Knights Armament Company SR-25 AMBI V2 Lower Receiver 121461
Knights Armament Company
$1,440.00The Knights Armament SR-25 AMBI V2 Lower Receiver Kit (121461) is a factory-complete lower assembly built for KAC's SR-25 platform in 7.62 NATO / .308 Win. It's forged from 7075-T6 aluminum and...$1,440.00 -
LMT Defense Pistol Lower MIDMLK125-MARS-LOWER
LMT Defense
$899.00Pistol Lower from Exclusive 12.5" MARS-L Specwar Pistol MIDMLK125-MARSP The LMT Defense Pistol Lower is the full-featured$899.00 -
Out of stock
Knights Armament Company 7.62MM SR-25A2 20" Upper Receiver Kit 121471
Knights Armament Company
$3,283.20The Knights Armament SR-25A2 20" Upper Receiver Kit brings genuine military heritage to the civilian AR-10 platform. As the commercial counterpart to the M110A2 — the U.S. military's semi-automatic...$3,283.20