311 4th Street NE

Stewartville, MN 55976

(507) 218-6884

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Website Designed By Michael McClellan


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

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.

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

Fresh Scent
Gun Oil

Clean and maintain your firearms while smelling great at the same time.

Hunter's Blend
Gun Oil

Clean and maintain your firearms without any scent at all perfect for hunting.

Permit to Carry Classes

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 and the next class day.

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.

Gun Show Roadmap

The Black Diamond Armory team frequently sets up shop at gun shows across Minnesota. 
Come visit, hang out, and check out all the latest gear we have to offer.

Exciting News Coming Soon


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