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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

  • Flat Shooting Rifles Part 3: The Reciprocating Hammer

    Low Mass:  Worth It? In my previous entries, I have covered muzzle devices and adjustable gas systems.  Now it’s time to address the final piece of the (hardware) puzzle, the reciprocating system.  This entails the Bolt Carrier Group (BCG), the...

    Posted By: Nathan Lindeman

    Posted On: February 11, 2020

  • Flat-Shooting Rifles Part 2: Tuning the Gas System

    Gas Blocks/Keys, and Gas Length All Play a Role In a previous post ( https://www.rainierarms.com/blog/whats-the-best-muzzle-device ) I went over the first step in achieving a flat-shooting rifle: The muzzle device.  I mentioned that was one piece o...

    Posted By: Nathan Lindeman

    Posted On: February 11, 2020

  • What You Need to Know About Buying Firearms & Ammunition Online

    For gun enthusiasts, we always look forward to finding a specific kind that would fit perfectly within the collection. If you are not, you may be the kind who needs it for safety purposes. Whatever reason it may be, in today’s modern century, online website...

    Posted By: rainierblog

    Posted On: November 27, 2019

  • How to Clean a Gun with Household Items

    One of the most important things we have to do to keep our guns in good condition is to clean them when it is due.  In the market, you'll find a variety of cleaning kits that will help you with this task, but sometimes investing in those tools is not s...

    Posted By: rainierblog

    Posted On: November 27, 2019