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The store will have temporary reduced hours due to medical reasons for the next 2 weeks.

We are only open the following:
Thursday 5/30 10am - 8pm
Saturday 6/1 10am - 6pm

Starting June 4th we will return to normal hours!

Check out our Blog page for news and updates.

Image by Trevor Brown

The AR of the Week deal is currently on hold, we are pivoting to DEALS OF THE WEEK to encompass more than just ARs. Stay tuned and get subscribed to our email list to get notified right away!

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Specializing in custom AR-15s, either from scratch or upgrading your own.

Your full service gun shop with plenty of attitude and hometown values.

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Who can Design and Assemble a Custom Firearm to Meet My Wants and Needs?

Black Diamond Armory is a fully Federal Firearms Licensed, Full Service Firearm Dealer that specializes in custom AR-15’s.

The look is as important as the function for today's shooter. Black Diamond Armory will lend a hand from the design process all the way to final assembly to create the one of a kind AR that stands out at the range. The days of cookie cutter AR15 rifles are behind us, now is the time to enjoy the performance and add 'The Look' to a tried and true rifle.

Check out our Firearms & Accessories

Our inventory is constantly changing and we are always striving towards having everything you need in our inventory or at least a click away. Check back often as new handguns, rifles, trade-ins, upper assemblies, lower assemblies, scopes, red dots, mounts, self defense items, storage, maintenance supplies, parts and ammo are always arriving.

Want to transfer gun ownership in a private sale? We do gun transfers for only $25. Call, email, or stop on by the shop to get started.

Reviews and Testimonials

Visit our Facebook Page for more! Click Here!


Stewie Neighbor

"I bought the gun oil from you today and tried it on several firearms and I love it so far! It applies like a dream and feels and looks awesome! I am totally sold, and I have used many oils over the years! To say this is the best so far is an understatement.  When I have some extra cash, I will buy a dozen or so and give them to all my friends. Thanks for totally rocking this!"


Don't forget, we now stock and sell a wide variety of ammo!

Permit to Carry Classes

Now available online! 

Purchase on the Store!

Black Diamond Armory offers a state certified comprehensive Minnesota permit to carry class multiple times a year.

We are under attack.  Express your 2nd amendment right and sign up for a class now.  Stand up and be counted!

See the CLASSES page for more details.

Gallery of Dreams

This page is dedicated to some of Black Diamond Armory’s badass firearms.  The road to badassery starts with an idea (and a job that leads to a paycheck).  With these humble beginnings and a bit of help from Black Diamond Armory, your custom build could find its way to these hallowed pages.


Check out some past builds and get inspired for your next build!

New store location and hours!
115 South Main Street
Stewartville, MN 55976
New Hours









10am - 6pm

10am - 6pm

10am - 8pm

10am - 6pm

10am - 6pm


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Get in touch with us for anything. general questions, feedback, custom build options, stock inquiry. We want to hear it all.

Call or email to start working on your dream AR-15 today.

Phone: (507) 218-6884

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