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AR15 build kits, parts & accessories

Right to Bear Arms and Supply has the best selection of AR-15 rifle build kits and gun parts for sale with the most competitive prices available anywhere online. We are a veteran-owned online gun parts dealer dedicated to providing the highest quality AR parts and accessories for those looking to build or upgrade their ARs with the most reliable, safest parts possible. We sell individual AR parts and accessories as well as full AR15 assembly kits from the highest quality brand names.

Building your own M4 rifle allows you to create truly unique ARs with endless options for customization from top to bottom. Shopping our selection of AR15 parts gives you the ability to build your rifle with the best parts, including our 80 percent lower receivers, upper receivers, trigger assemblies and bolt carrier groups, with several parts offering nickel boron or nickel Teflon coating. Our entire inventory of AR gun parts for sale has been chosen for their ability to provide the accuracy, durability and longevity you need when performing your own AR15 assembly. We have years of experience building and operating ARs and can provide all the technical information you’ll need to make the right buying decision. Buy today or contact us for more information about our M16 rifle build kits and gun parts for sale.

Veteran owned

high-end optics

lightning fast shipping

BG 5" 5.56 1:5 Twist Upper Receiver | Flash Can | 7" M-LOK | Without BCG & CH

MSRP:

MSRP: $397.95

Sale Price: $191.95 - $224.95

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BG 5" 300 BLK 1:5 Twist Upper Receiver | Flash Can | 4.25" TR M-LOK | Without BCG & CH

MSRP:

MSRP:

Sale Price: $410.95 - $418.95

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RTB 8.3" 9mm Upper Receiver | FLASH CAN | 9" M-LOK | Without BCG & CH

MSRP:

MSRP: $457.95

Sale Price: $219.95 - $249.95

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Tactical Sports SBA6 Pistol Lower Build Kit - Adjustable Pistol Brace

MSRP:

MSRP:

Sale Price: (Inc. Tax)

MSRP: $179.95

SALE PRICE: $139.95

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SB Tactical SBA6 Adjustable Pistol Brace + TS Buffer Tube Kit

MSRP:

MSRP:

Sale Price: (Inc. Tax)

MSRP: $169.95

SALE PRICE: $99.99

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SB Tactical SBA6 Adjustable Pistol Brace + Mil-Spec Buffer Tube Kit

MSRP:

MSRP:

Sale Price: (Inc. Tax)

MSRP: $179.99

SALE PRICE: $119.95

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DURAMAG SPEED AR-15 30-Round Aluminum Magazine for 5.56/.223/.300 BLK - Orange Follower

MSRP:

MSRP:

Sale Price: (Inc. Tax)

MSRP: $19.10

SALE PRICE: $16.95

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DURAMAG SPEED AR-15 30-Round Aluminum Magazine for 5.56/.223/.300 BLK - Black Follower

MSRP:

MSRP:

Sale Price: (Inc. Tax)

MSRP: $19.10

SALE PRICE: $16.95

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Oct 13, 2026 Kevin

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Oct 1, 2026 Kevin

Lower Parts Kit vs. Lower Build Kit: What’s the Difference?

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