Sig Sauer Guns and Accessories
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Need assistance? Call us at 573-859-6044.

Please note this site is owned and operated by Osage County Guns. We are not the manufacturer, Sig Sauer.

AR-15 Upper Receivers

Sig516 16 inch Upper Receiver Assembly
Price: $1,099.00
Sig Sauer 516 10 inch Upper Receiver Assembly
Price: $1,199.00
Sig Sauer 516 14.5" Upper Receiver
Price: $1,099.00
Sig Sauer 516 18" Upper Receiver
Price: $1,099.00
Sig Sauer 516 7" Upper Receiver
Price: $1,099.00
Advanced Armament - 9" AAC 300 Blackout Upper Receiver
Price: $1,199.00
Sig Sauer 516 Gen 2 14.5" Upper Receiver
Price: $1,132.00
Sig Sauer 516 Gen 2 10" Upper Receiver Assembly
Price: $1,132.00
Sig Sauer 516 Gen 2 16" Upper Receiver Assembly
Price: $999.00
Sig Sauer 516 7" Upper Receiver
Price: $1,099.00
Sig Sauer M400 16" Classic AR-15 Upper Receiver
Price: $699.00
Sig Sauer M400 16" SRP AR-15 Upper Receiver
Price: $599.00
Sig Sauer M400 16" Enhanced Carbine AR-15 Upper Receiver
Price: $719.00
Sig Sauer M400 16" Enhanced FDE AR-15 Upper Receiver
Price: $719.00
Sig Sauer M400 16" SWAT AR-15 Upper Receiver
Price: $759.00
Sig Sauer 516 Gen2 Upper Receiver - Full Auto
Price: $1,199.00
Sig Sauer 516 Gen2 10" Full Auto Upper Receiver
Price: $1,199.00

We currently stock four brands of upper receivers. The upper receivers can be used on an AR-15 pistol or rifle lower. If you pair a rifle lower receiver with an upper that has an overall barrel length of 16", you will have to register your rifle as a SBR (short barrel rifle).

The uppers with overall barrel lengths of less than 16" can be used on a pistol lower without any NFA required registration.

The brand that we currently stock are Sig Sauer, Primary Weapons Systems, Advanced Armament, and Spikes Tactical (coming to our site soon).

Sig Sauer's 516 uppers now have the updated Gen 2 gas system. Sig overhauled the design to make it more reliable and maintenance / cleaning easier. Sig's uppers are only available in 5.56mm. The Sig uppers that we sell do have a full auto bolt carrier group.

Primary Weapons Systems uppers are offered in a variety of barrel lengths and calibers. We will carry nearly the full line which include barrel lengths of 7", 9", 10", 12", 14.5", and 16". They currently off calibers including 5.56mm, 7.62mm, and .300 Blackout.

Advanced Armament currently only offers their upper in 9" and 16" and the only caliber is .300 Blackout. Advanced Armament uses a Knights Armament quad rail.

Spikes Tactical offers a variety of lengths, calibers, and accessory configurations. We'll post more info as we receive shipments.

Unless otherwise noted in the product specs, all the upper receivers that we sell have a quad rail. 

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