(0) 
Newsletter
Product no.: 100027483
Mfr. No.: 001-SD MAG-AD9-
860141001508 There's no need to go with a pistol-caliber specific AR lower on your next pistol-caliber carbine build. With the Stern Defense AR-15 9mm Conversion Adapter you have the ability to utilize popular pistol magazines which you may already have a supply of. Stern Defense make two differ models of their Conversion Adapter, one which uses Glock® magazines, and one which uses either Smith & Wesson M&P or Sig 320/250 magazines. The Stern Defense AR-15 9mm Conversion Adapter is easily installed into any mil-spec AR-15 lower receiver within seconds and even incorporates a last-round bolt hold open feature. Each adapter is machined from aluminum and requires the use of a 9mm/.40 S&W barrel and a Glock-cut bolt. Made of aircraft grade aluminum Lightweight, ergonomic design Installs in seconds If you’re considering converting your AR-15 to a 9mm, give the Stern Defense Adapter a thought!Backorderable, delivery time approx. 4-12 weeks from the USA warehouse.
There's no need to go with a pistol-caliber specific AR lower on your next pistol-caliber carbine build. With the Stern Defense AR-15 9mm Conversion Adapter, you can utilize popular pistol magazines that you may already have a supply of.
If you’re considering converting your AR-15 to a 9mm, give the Stern Defense Adapter a thought!
AR-15
Not perfect but close 06/10/2018
This adapter is fantastic. The pistol I used fed reliably from all the Glock mags that fit in the well, including 40 S&W and 357 SIG magazines. Installation and adjustment is a matter of turning in one screw to set it, and then two more for standoffs so it doesn't move around when you seat a new magazine.
The only reason I took off a star is because the mag release is a little awkward to use, the thing was very sticky with an aftermarket 9mm drum magazine, and the bolt hold open was a little hyper aggressive and held the bolt open with one still in the magazine.
Awesome 21/08/2018
Been looking for a reliable 9mm conversion for almost a year and after tons of researches (forum and YT), I decided to bite the bullet and purchase Stern Defense.
I have to say this thing is amazing, I installed this to my Anderson lower and it fits perfectly no play and nothing. To be on the safe side, I purchased Stern Defense Upper (from their website) paired with their H3 Buffer.
Went to the range today and shot 1000rounds and ZERO hiccup! I ran all kinds of ammo (freedommunitions 115/147gn, Fiocchi 115gn, and Sellier&Bellot 115gn)
All and all, I'm very satisfied with the product!
We encountered an error while loading this content. Please refresh the page to continue. If the issue persists, contact our customer support.
to Brownells UK, your destination for anything gun related. With our roots in a genuine passion for firearms, we bring you an unmatched selection of Gun Parts, Firearm Accessories, Gunsmithing Tools, Scopes & Red Dot Sights and Expert Knowledge.
Whether you're looking to maintain, repair, or upgrade, we've got what you need!
For Shooters, By Shooters
We share your enthusiasm and know exactly what you're looking for because we're part of the community.
Massive Selection
From the essentials to the unique, find everything under one roof.
Our blend of tradition and innovation
Shop with the convenience of modern technology, backed by a legacy of experience.
Browse our collection and discover why we're the trusted name in shooting sports & hunting.
© 2026 Brownells UK
Part of the Brownells Europe Group
Classical view
Mobile view
Help and contact
