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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: Legally Building a Short Barreled Rifle

    Yes, You Can Have a Short-Barreled Rifle (SBR) Most people don’t realize that it’s legal to own an SBR in most states. While these items are NFA controlled, and a little more time-taking to buy, owning one is not as difficult as you might think. For our...

    Posted By: rainierblog

    Posted On: June 5, 2020

  • Build of the Week: A quality, lightweight AR build designed for 3-Gun

    Our Build of the Week this week comes from Lisa Supon. This AR was designed and built specifically to shoot 3-Gun. Lisa needed a lightweight, quality rifle, and when she began shopping she found that everything prebuilt on the market that fit the bill was pro...

    Posted By: rainierblog

    Posted On: June 1, 2020

  • 6 things to know before you buy an AR pistol

    AR pistols are growing in popularity, and it’s no wonder: They are easy to shoot, easy to store, and endlessly modifiable. There are a lot of good reasons to put an AR pistol at the top of your shopping list, but there are also a lot of questions about the ...

    Posted By: rainierblog

    Posted On: May 22, 2020

  • First Time Buyer

    So you bought a gun during the Coronavirus 2020 Sales Surge, now what? One thing this time of uncertainty has brought us is yet another big surge in the demand for firearms and ammunition.  What really seems to set this surge apart, however, is the dem...

    Posted By: rainierblog

    Posted On: May 7, 2020