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The ultimate stop for AR-15 Rifles and AR-15 parts

We are one of the largest online sources for quality AR-10 and AR-15 rifles, parts and accessories. Shop our selection of complete and stripped Uppers and Lowers, find Barrels and Ammo for your firearms, gear yourself up with quality Gear and Apparel. We have it all!

Rainier Arms was started by enthusiasts for enthusiasts. We specialize in high-end AR-15/M16 rifles, parts and accessories. If we won't use it, we won't sell it.

We offer a wide variety of firearms and firearm parts from all your favorite manufacturers. Satisfy your needs from brands such as Glock, SIG, S&W, Primary Arms, Stag Arms, PWS, Rainier Arms and many others. Browse all manufacturers.

Great store for high-end firearms. Very very knowledgeable staff.
Rainier Arms is my go to dealer for high-end AR15 parts and accessories online. They always have a great selection of parts in stock. Many you can't find anywhere else.
Great shop with easy order pick up for locals making online purchases.

Latest Blog Posts

  • Build of the Week for His and Hers

     This weeks Build of the Week is a pair of Sig Sauer P365 pistols customized for our Purchasing Director and his Wife for EDC. Except we are using a bit of a cheat code, as the majority of the modifications were done by the good folks at Da...

    Posted By: rainierblog

    Posted On: September 18, 2020

  • Best Sig Sauer P320 upgrades – 2020 Part 1 of 2: The Upper Half

    The Sig Sauer P320 has been, without a doubt, one of the more exciting pistol platforms introduced in the past decade. This is, measured based on military and law enforcement adoption, popularity within the competitive communities, and the vast aftermarket sup...

    Posted By: Aristotle Bartolome

    Posted On: August 13, 2020

  • The SIG P320 Build of the Week

    This week's build of the week is another one of our staffer's gun builds. Although it technically is a Sig Sauer P320 gun, about the only thing left that came out of the Sig Sauer plant that's actually on the gun, is the Fire Control Unit and some of the uppe...

    Posted By: Aristotle Bartolome

    Posted On: August 5, 2020

  • Best MINI Red dot sights for Compact Guns – 2020

    The red dot sight is one of the most versatile and easy to use sighting system for firearms used today. Couple that with the fact that better options are becoming available at a much more affordable price with many more companies taking notice and jumping in ...

    Posted By: Aristotle Bartolome

    Posted On: July 31, 2020