Stern Defense AR-15 Conversion Block for Glock 9mm and .40 S&W Magazines
Details
Details
The Stern Defense AR-15 Conversion Block for Glock 9mm and .40 S&W Magazines provides a seamless solution for converting standard AR-15 lower receivers to accept Glock magazines in 9mm and .40 S&W calibers. Installing in seconds, the Stern Defense Mag-AD9 adapter features last round bolt hold open functionality, setting it apart from other PCC builds. Constructed from high-quality 6061-T6 aluminum, it boasts a durable type 3 hardcoat anodized finish. The feed ramp is made from 4140 steel and coated with NiB (Nickel Boron) for enhanced reliability and smooth feeding.
Convert your standard AR-15 lower assembly to accept Glock magazines with the reliable and convenient Stern Defense AR-15 Conversion Block. Experience smooth feeding, last round bolt hold open functionality, and compatibility with various Glock magazine generations. This adapter, made in the U.S.A., is an essential addition for law enforcement personnel and firearm enthusiasts.
Note: This conversion block requires the use of a 5.4-ounce buffer or heavier when utilizing a carbine spring.
Features:
- Designed for use with 9mm or .40 caliber barrels and Glock cut bolts
- Constructed from 6061-T6 aluminum with type 3 hardcoat anodized finish
- 4140 steel NiB coated feed ramp for reliability
- Ergonomic magazine release
- Last round bolt hold open functionality
- Works with all generations of Glock magazines
- Compatible with any Mil-Spec lower receiver
- Made in the U.S.A.
California Prop 65 warning
WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to www.P65Warnings.ca.gov.Ratings & Reviews
6 reviews
Great 9mm conversion. A must for an AR owner who wants to shoot and train with cheaper ammo
by Barry -
Works as advertised, just follow instruction for lower install( Literally installs less than two minutes and comes off less than that). Ran with my few KCI mags and ran with no problem and BHO worked. Occasionally bolt will not hold open but narrowed it down to the same glock magazine(gen 3). Used with a FM 16” upper with red dot combo (Kit-FM16-9MM-3-MB-MD-RBGII) and ran great. For some reason Glock gen 4 mags will not drop free but my old KCI will( I got lucky).Lefty here so mag release works out to my advantage. A bit pricey but cheaper than getting a dedicated lower and have it registered.
An Amazing Transformation
by Tree
I bought a Fox Trot Mike upper from PA and a Design !7 folding lower and paired them with the Stern Defense conversion block and I created a monster!!! The build shoots so well!! I can easily tear up targets at 50 yards with a Vortex red dot with no problems. It's really incredible!!!
Awesome adapter
by Jack Mehoff
I’ve ran at least 1000 rounds of Winchester target ammo with aftermarket and OEM glock mags. This adapter is flawless.
I recommend this
by Carl
I have a foxtrot upper mated to this in an AR lower. It works better than the Foxtrot Mike lower as it has a feed ramp. If you’re not loaded and want flexibility I’d do this in an AR lower with any Foxtrot Mike upper. It has LRBHO too. Very dependable.
i like it a lot.
by mossbergmike
i bought it because i like the last shot hold open. it feeds and functions great. all factory ammo. light tightgroup loads. to heavy blue dot with 147g loads. in every bullet type. with a palmetto state upper.
This item works great!
by Matt -
Mounted on an LWRC IC-DI lower with a New Frontier Armory .40 S&W 16” side-charging upper. Solid all-metal construction with easy installation. Cycles FMJ rounds perfectly, although I haven’t tried JHP or other defensive rounds yet. Factory Glock 22/23 mags fit perfectly and drop free when mag release is depressed (need some training cycles there, though). LRBHO works every time. I wanted something for the interim until I get a dedicated AR40 lower, but not sure I need to spend the money now! Highly recommended.