B5 Systems
B5 Systems is a leading manufacturer of high-quality firearms components and accessories. Their product line includes stocks, handguards, grips, and more, each designed to provide superior performance, comfort, and durability. B5 Systems products are made with the user in mind, and are constructed using only the finest materials and advanced manufacturing techniques. Whether you're looking to upgrade your existing firearm or build a new one, B5 Systems has the products and expertise to help you achieve your goals. Browse their selection of stocks, handguards, grips, and other components to find the perfect products for your needs.
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Out of stock
Aero Precision M4E1 Threaded Complete Upper, 16" 5.56 Mid-Length Barrel, ATLAS R-ONE 15" M-LOK HG - Kodiak Brown
Aero Precision
MSRP: $509.99$449.99Aero Precision M4E1 Threaded Complete Upper, 16" 5.56 Mid-Length Barrel, ATLAS R-ONE 15" M-LOK HG - Kodiak Brown This complete upper includes our new ATLAS R-ONE Handguard! The R-ONE handguards are designed with size and weight in mind, while still...MSRP: $509.99$449.99 -
Out of stock
Aero Precision M4E1 Threaded Complete Upper, 18" 6.5 Grendel SS Barrel ATLAS S-ONE 15" M-LOK HG - Anodized Black
Aero Precision
MSRP: $730.00$622.95M4E1 Threaded Complete Upper, 18" 6.5 Grendel SS Barrel ATLAS S-ONE 15" M-LOK HG - Anodized Black Superior Precision and Long-Range Performance Enhance your AR-15 with the M4E1 Threaded Complete Upper, featuring an 18-inch 6.5 Grendel stainless steel...MSRP: $730.00$622.95 -
Out of stock
Aero Precision M4E1 Threaded Complete Upper, 7.5" 5.56 Barrel, 7" M-LOK ATLAS S-ONE Handguard - Anodized Black
Aero Precision
MSRP: $424.99$344.95Aero Precision M4E1 Threaded Complete Upper, 7.5" 5.56 Barrel, 7" M-LOK ATLAS S-ONE Handguard - Anodized Black This complete upper includes our new ATLAS S-ONE Handguard! The S-ONE line of handguards are designed with size and weight in mind, providing...MSRP: $424.99$344.95 -
Out of stock
Aero Precision M4E1 Threaded Complete Upper, 8" 5.56 Barrel, 7.3" M-LOK ATLAS R-ONE Handguard - Anodized Black
Aero Precision
MSRP: $565.00$504.95Aero Precision M4E1 Threaded Complete Upper, 8" 5.56 Barrel, 7.3" M-LOK ATLAS R-ONE Handguard - Anodized Black This complete upper includes our ATLAS R-ONE Handguard! The R-ONE handguards are designed with size and weight in mind, while still providing...MSRP: $565.00$504.95 -
Out of stock
Aero Precision M4E1 Threaded Complete Upper, 8" 5.56 Barrel, 7.3" M-LOK ATLAS S-ONE Handguard - Anodized Black
Aero Precision
MSRP: $565.00$484.95Aero Precision M4E1 Threaded Complete Upper, 8" 5.56 Barrel, 7.3" M-LOK ATLAS S-ONE Handguard - Anodized Black This complete upper includes our ATLAS S-ONE Handguard! The S-ONE line of handguards are designed with size and weight in mind, providing the...MSRP: $565.00$484.95 -
Out of stock
Aero Precision M4E1 Threaded No FA Complete Upper 10.5" 5.56 Carbine 9.2" M-LOK ATLAS S-ONE - Anodized Black
Aero Precision
MSRP: $499.00$427.95Aero Precision M4E1 Threaded No FA Complete Upper 10.5" 5.56 Carbine 9.2" M-LOK ATLAS S-ONE - Anodized Black Sleek, Lightweight, and Ready for Precision Performance The Aero Precision M4E1 Threaded No FA Complete Upper is engineered for AR-15 enthusiasts...MSRP: $499.00$427.95 -
Out of stock
Aero Precision M4E1 Threaded No FA Complete Upper 16" 5.56 Mid 15" M-LOK ATLAS R-ONE - Anodized Black
Aero Precision
MSRP: $645.00$550.95Aero Precision M4E1 Threaded No FA Complete Upper 16" 5.56 Mid 15" M-LOK ATLAS R-ONE - Anodized Black Lightweight and Customizable Upper with ATLAS R-ONE Handguard and No Forward Assist The Aero Precision M4E1 Threaded No Forward Assist Complete Upper...MSRP: $645.00$550.95 -
Out of stock
Aero Precision M4E1 Threaded No FA Complete Upper 16" 5.56 Mid 15" M-LOK ATLAS S-ONE - Anodized Black
Aero Precision
MSRP: $645.00$550.95Aero Precision 16" 5.56 M4E1 Threaded Complete Upper - Anodized Black Built for Precision, Durability, and Maximum Customization The Aero Precision M4E1 Threaded No FA Complete Upper with a 16-inch barrel delivers a high-performance solution for AR-15...MSRP: $645.00$550.95 -
Out of stock
Aero Precision M4E1 Threaded PRO 12.5" CHF 5.56 M-LOK Midlength Complete Upper
Aero Precision
MSRP: $1,095.00$950.95Aero Precision M4E1 Threaded PRO 12.5" CHF 5.56 M-LOK Midlength Complete Upper The PRO Upper Receiver Group built around our PRO 5.56 Cold Hammer Forged Barrel that is paired with our PRO 5.56 BCG. Included ATLAS R-ONE Handguard, BREACH Charging Handle,...MSRP: $1,095.00$950.95 -
Out of stock
Aero Precision M4E1 Threaded PRO 16.3" CHF 5.56 M-LOK Midlength Complete Upper
Aero Precision
MSRP: $1,145.00$993.95Aero Precision M4E1 Threaded PRO 16.3" CHF 5.56 M-LOK Midlength Complete Upper The PRO Upper Receiver Group built around our PRO 5.56 Cold Hammer Forged Barrel that is paired with our PRO 5.56 BCG. Included ATLAS R-ONE Handguard, BREACH Charging Handle,...MSRP: $1,145.00$993.95 -
Out of stock
Aero Precision M4E1-T 16" 5.56 Carbine Complete Upper w/ 15? M-LOK ATLAS S-ONE Handguard
Aero Precision
MSRP: $645.00$550.95Aero Precision M4E1-T 16" 5.56 Carbine Complete Upper w/ 15? M-LOK ATLAS S-ONE Handguard The Aero Precision M4E1 Threaded AR-15 Barreled Upper Receiver is perfect for shooters who are looking for a little more out of their build. The unique receiver...MSRP: $645.00$550.95 -
Out of stock
Aero Precision M4E1-T 18" .223 Wylde Rifle Complete Upper w/ 15" M-LOK ATLAS S-ONE Handguard
Aero Precision
MSRP: $700.00$607.95Aero Precision M4E1-T 18" .223 Wylde Rifle Complete Upper w/ 15" M-LOK ATLAS S-ONE Handguard This complete upper includes our ATLAS S-ONE Handguard! The S-ONE line of handguards are designed with size and weight in mind, providing the perfect addition...MSRP: $700.00$607.95 -
Out of stock
Aero Precision M4E1-T Complete Upper, 16" .223 Wylde SS Barrel, 15" M-LOK ATLAS S-ONE HG - Anodized
Aero Precision
MSRP: $575.00$494.95Aero Precision M4E1-T Complete Upper, 16" .223 Wylde SS Barrel, 15" M-LOK ATLAS S-ONE HG - Anodized This complete upper includes our new ATLAS S-ONE Handguard! The S-ONE line of handguards are designed with size and weight in mind, providing the perfect...MSRP: $575.00$494.95 -
Out of stock
Aero Precision M4E1-T Complete Upper, 16" .300 Blackout Barrel, 12" M-LOK ATLAS S-ONE HG - Anodized Black
Aero Precision
MSRP: $550.00$504.95Aero Precision M4E1-T Complete Upper, 16" .300 Blackout Barrel, 12" M-LOK ATLAS S-ONE HG - Anodized Black This complete upper includes our new ATLAS S-ONE Handguard! The S-ONE line of handguards are designed with size and weight in mind, providing the...MSRP: $550.00$504.95 -
Out of stock
Aero Precision M4E1-T Complete Upper, 16" .300 Blackout Barrel, 15" M-LOK ATLAS S-ONE HG - Anodized Black
Aero Precision
MSRP: $660.00$573.95Aero Precision M4E1-T Complete Upper, 16" .300 Blackout Barrel, 15" M-LOK ATLAS S-ONE HG - Anodized Black This AERO Precision Complete Upper is equipped with the new ATLAS S-ONE Handguard, part of our S-ONE line that emphasizes size reduction and weight...MSRP: $660.00$573.95 -
Out of stock
Aero Precision M4E1-T Complete Upper, 8" .300 Blackout Barrel, 7" M-LOK ATLAS S-ONE HG, Anodized Black
Aero Precision
MSRP: $595.00$516.95Aero Precision M4E1-T Complete Upper, 8" .300 Blackout Barrel, 7" M-LOK ATLAS S-ONE HG, Anodized Black This complete upper includes our new ATLAS S-ONE Handguard! The S-ONE line of handguards are designed with size and weight in mind, providing the...MSRP: $595.00$516.95 -
Aero Precision M5 (.308) Assembled Upper Receiver
Aero Precision
MSRP: $215.00 - $235.00$181.95 - $195.95Aero Precision M5 (.308) Assembled Upper Receiver The M5 .308 Assembled Upper Receiver comes with both the port door and forward assist hardware pre-installed. Forged from 7075-T6 aluminum, this assembled upper is precision machined to accept standard ...MSRP: $215.00 - $235.00$181.95 - $195.95 -
Out of stock
Aero Precision M5 (.308) Assembled Upper Receiver - OD Green
Aero Precision
MSRP: $235.00$195.95Aero Precision M5 (.308) Assembled Upper Receiver - OD Green The M5 .308 Assembled Upper Receiver comes with both the port door and forward assist hardware preinstalled. Forged from 7075-T6 aluminum, this assembled upper is precision machined to accept...MSRP: $235.00$195.95 -
Out of stock
Aero Precision M5 (.308) Assembled Upper Receiver - Sniper Grey Cerakote
Aero Precision
MSRP: $235.00$199.95Aero Precision M5 (.308) Assembled Upper Receiver - Sniper Grey Cerakote The M5 .308 Assembled Upper Receiver comes with both the port door and forward assist hardware preinstalled. Forged from 7075-T6 aluminum, this assembled upper is precision machined...MSRP: $235.00$199.95 -
Aero Precision M5 (.308) Enhanced M-LOK Handguard, Gen 2 w/ BAR Barrel Nut - Anodized Black
Aero Precision
MSRP: $220.00 - $265.00$185.95 - $223.95Aero Precision M5 (.308) Enhanced M-LOK Handguard, Gen 2 w/ BAR Barrel Nut - Anodized Black Our Enhanced M-LOK Handguards provide a lightweight free float design for your custom M5 .308 build. The M-LOK system allows advanced modularity past the current...MSRP: $220.00 - $265.00$185.95 - $223.95 -
Out of stock
Aero Precision M5 (.308) Enhanced M-LOK Handguard, Gen 2 w/ BAR Barrel Nut - FDE
Aero Precision
MSRP: $285.00$242.95Aero Precision M5 (.308) Enhanced M-LOK Handguard, Gen 2 w/ BAR Barrel Nut - FDE Our Enhanced M-LOK (EM) Handguards provide a lightweight free float design for your custom M5 .308 build. The M-LOK system allows advanced modularity past the current 1913...MSRP: $285.00$242.95 -
Out of stock
Aero Precision M5 15" Enhanced M-LOK Handguard Gen 2 - Black
Aero Precision
MSRP: $220.00$185.95Aero Precision M5 15" Enhanced M-LOK Handguard Gen 2 - Black Our Enhanced M-LOK (EM) Handguards provide a lightweight free float design for your custom M5 .308 build. The M-LOK system allows advanced modularity past the current 1913 picatinny rail...MSRP: $220.00$185.95 -
Out of stock
Aero Precision M5 15" Enhanced Quad Rail Handguard Gen 2 - Anodized Black
Aero Precision
MSRP: $220.00$199.99Aero Precision M5 15" Enhanced Quad Rail Handguard Gen 2 - Anodized Black Our Gen 2 Enhanced Quad Rail (EQ) Handguards provide a lightweight free float design for your custom M5 .308 build. Changes include redesigned quick disconnect sling sockets,...MSRP: $220.00$199.99 -
Out of stock
Aero Precision M5 16.6" Enhanced M-LOK Handguard Gen 2 - FDE Cerakote (w/ DPMS Barrel Nut)
Aero Precision
MSRP: $295.00$251.95Aero Precision M5 16.6" Enhanced M-LOK Handguard Gen 2 - FDE Cerakote (w/ DPMS Barrel Nut) Our Enhanced M-LOK (EM) Handguards provide a lightweight free float design for your custom M5 .308 build. The M-LOK system allows advanced modularity past the...MSRP: $295.00$251.95 -
Aero Precision M5 18" .308 SS Fluted Complete Upper Receiver with 15" ATLAS S-ONE Handguard - Cerakote FDE
Aero Precision
MSRP: $920.00$789.95Aero Precision M5 18" .308 SS Fluted Complete Upper Receiver with 15" ATLAS S-ONE Handguard - Cerakote FDE This complete upper includes our ATLAS S-ONE Handguard! The S-ONE line of handguards are designed with size and weight in mind, providing the...MSRP: $920.00$789.95 -
Aero Precision M5 6.5 Creedmoor Rifle M-LOK Complete Upper - Atlas R-ONE FDE - 20"
Aero Precision
MSRP: $895.00$764.95Aero Precision M5 6.5 Creedmoor Rifle M-LOK Complete Upper - Atlas R-ONE FDE - 20" Aero Precision M5 Barreled Uppers are changing the way you shoot large calibers out of a semi-automatic AR-10 platform. The AR-308 platform is not as plug and play as the...MSRP: $895.00$764.95 -
Out of stock
Aero Precision M5 ATLAS R-ONE M-LOK Handguard
Aero Precision
MSRP: $220.00 - $270.00$185.95 - $227.95Aero Precision M5 ATLAS R-ONE M-LOK Handguard R-ONE Handguards are now available for the M5 platform. Machined from 6061-T6 Aluminum, the R-ONE offers a lightweight and slim profile that features a full-length top Picatinny rail section allowing the user...MSRP: $220.00 - $270.00$185.95 - $227.95 -
Aero Precision M5 ATLAS S-ONE M-LOK Handguard
Aero Precision
MSRP: $220.00 - $270.00$185.95 - $227.95Aero Precision M5 ATLAS S-ONE M-LOK Handguard S-ONE Handguards are now available for the M5 platform. Machined from 6061-T6 Aluminum, the R-ONE offers a lightweight and slim profile that features a full-length top Picatinny rail section allowing the user...MSRP: $220.00 - $270.00$185.95 - $227.95 -
Out of stock
Aero Precision M5 Complete Upper 16" .308 Mid SS Barrel ATLAS R-ONE 15" M-LOK HG - Anodized Black
Aero Precision
MSRP: $810.00$694.95Aero Precision M5 Complete Upper 16" .308 Mid SS Barrel ATLAS R-ONE 15" M-LOK HG - Anodized Black The R-ONE handguards are designed with size and weight in mind, while still providing plenty of real-estate to accommodate any attachment needs the end user...MSRP: $810.00$694.95 -
Out of stock
Aero Precision M5 Complete Upper 18" 6.5 Creedmoor SS Mid-Length Barrel ATLAS R-ONE 15" M-LOK HG - Anodized Black
Aero Precision
MSRP: $845.00$724.95Aero Precision M5 Complete Upper 18" 6.5 Creedmoor SS Mid-Length Barrel ATLAS R-ONE 15" M-LOK HG - Anodized Black The R-ONE handguards are designed with size and weight in mind, while still providing plenty of real-estate to accommodate any attachment...MSRP: $845.00$724.95 -
Out of stock
Aero Precision M5 Complete Upper 20" .308 Rifle Barrel ATLAS S-ONE 15" M-LOK HG - Anodized Black
Aero Precision
MSRP: $800.00$684.95Aero Precision M5 Complete Upper 20" .308 Rifle Barrel ATLAS S-ONE 15" M-LOK HG - Anodized Black The S-ONE line of handguards are designed with size and weight in mind, providing the perfect addition to your lightweight build. Our proprietary ATLAS...MSRP: $800.00$684.95 -
Out of stock
Aero Precision M5 Complete Upper 20" .308 Rifle Barrel ATLAS S-ONE 15" M-LOK HG - FDE Cerakote
Aero Precision
MSRP: $840.00$728.95Aero Precision M5 Complete Upper 20" .308 Rifle Barrel ATLAS S-ONE 15" M-LOK HG - FDE Cerakote The S-ONE line of handguards are designed with size and weight in mind, providing the perfect addition to your lightweight build. Our proprietary ATLAS...MSRP: $840.00$728.95 -
Out of stock
Aero Precision M5 Complete Upper 20" 6.5 Creedmoor SS Rifle Barrel ATLAS R-ONE 15" M-LOK HG - Black
Aero Precision
MSRP: $855.00$731.95Aero Precision M5 Complete Upper 20" 6.5 Creedmoor SS Rifle Barrel ATLAS R-ONE 15" M-LOK HG - Black Long-range precision shooting at its best with a robust 20” stainless steel barrel and lightweight ATLAS R-ONE handguard. The Aero Precision M5...MSRP: $855.00$731.95 -
Out of stock
Aero Precision M5 Complete Upper 22" 6.5 Creedmoor SS Rifle Barrel ATLAS R-ONE 15" M-LOK HG - Black
Aero Precision
MSRP: $865.00$740.95Aero Precision M5 Complete Upper 22" 6.5 Creedmoor SS Rifle Barrel ATLAS R-ONE 15" M-LOK HG - Black Precision and performance meet with Aero's 22” stainless steel barrel and slim-profile R-ONE handguard for exceptional long-range shooting...MSRP: $865.00$740.95 -
Out of stock
Aero Precision M5 Complete Upper 22" 6.5 Creedmoor SS Rifle Barrel ATLAS R-ONE 15" M-LOK HG - FDE Cerakote
Aero Precision
MSRP: $905.00$774.95Aero Precision M5 Complete Upper 22" 6.5 Creedmoor SS Rifle Barrel ATLAS R-ONE 15" M-LOK HG - FDE Cerakote The R-ONE handguards are designed with size and weight in mind, while still providing plenty of real-estate to accommodate any attachment needs...MSRP: $905.00$774.95 -
Out of stock
Aero Precision M5 Complete Upper 22" 6.5 Creedmoor SS Rifle Barrel ATLAS S-ONE 15" M-LOK HG - Black
Aero Precision
MSRP: $865.00$740.95Aero Precision M5 Complete Upper 22" 6.5 Creedmoor SS Rifle Barrel ATLAS S-ONE 15" M-LOK HG - Black Precision Long-Range Performance with Lightweight ATLAS S-ONE Handguard This Aero Precision M5 Complete Upper features a 22" fluted 6.5 Creedmoor...MSRP: $865.00$740.95 -
Out of stock
Aero Precision M5 Complete Upper 22" 6.5 Creedmoor SS Rifle Barrel ATLAS S-ONE 15" M-LOK HG - FDE Cerakote
Aero Precision
MSRP: $905.00$774.95Aero Precision M5 Complete Upper 22" 6.5 Creedmoor SS Rifle Barrel ATLAS S-ONE 15" M-LOK HG - FDE Cerakote This 6.5 Creedmoor upper is an easy upgrade to your existing or new build M5/308 AR. Utilizing all compatible parts with the exception of the...MSRP: $905.00$774.95 -
Out of stock
Aero Precision M5 Complete Upper 24" 6.5 Creedmoor SS Rifle Barrel ATLAS R-ONE 15" M-LOK HG - Anodized Black
Aero Precision
MSRP: $885.00$755.95Aero Precision M5 Complete Upper 24" 6.5 Creedmoor SS Rifle Barrel ATLAS R-ONE 15" M-LOK HG - Anodized Black The R-ONE handguards are designed with size and weight in mind, while still providing plenty of real-estate to accommodate any attachment needs...MSRP: $885.00$755.95 -
Out of stock
Aero Precision M5 Complete Upper 24" 6.5 Creedmoor SS Rifle Barrel ATLAS S-ONE 15" M-LOK HG - Black
Aero Precision
MSRP: $885.00$755.95Aero Precision M5 Complete Upper 24" 6.5 Creedmoor SS Rifle Barrel ATLAS S-ONE 15" M-LOK HG - Black This Aero Precision M5 Complete Upper with a 24" 6.5 Creedmoor stainless steel rifle-length barrel and ATLAS S-ONE Handguard is a perfect solution for...MSRP: $885.00$755.95 -
Out of stock
Aero Precision M5 Complete Upper, 16" .308 Mid Barrel, ATLAS S-ONE 15" M-LOK HG - FDE Cerakote
Aero Precision
MSRP: $820.00$714.95Aero Precision M5 Complete Upper, 16" .308 Mid Barrel, ATLAS S-ONE 15" M-LOK HG - FDE Cerakote M5 Complete Upper, 16" .308 Mid Barrel, ATLAS S-ONE 15" M-LOK HG - FDE Cerakote Specifications: Platform: M5 Series: ATLAS Caliber: .308...MSRP: $820.00$714.95