The ProMag 9mm-to-AR-15 Magazine Quick-Change Adapter Block (part no. PM237B) installs in an AR-15/M16 lower receiver so a 9mm upper can run 9mm Colt/SMG-style magazines in place of standard .223/5.56 magazines — it’s a caliber-conversion adapter block, not a magazine or a pistol-grip magwell. ProMag builds it from high-strength polymer with steel hardware, and it installs without removing the bolt stop roll pin for a quick caliber swap.

Key Specifications

• Installs in an AR-15/M16 lower receiver to run a 9mm upper.
• Lets the lower accept 9mm Colt/SMG-style magazines instead of .223/5.56 magazines.
• Built from high-strength polymer with steel hardware, roller, ejector, and bolt stop.
• Installs without removing the bolt stop roll pin for a quick caliber swap.
• Made in the USA.
• Finished in black.
• Manufactured by ProMag.

Frequently Asked Questions

What does this adapter block do? It installs in an AR-15/M16 lower receiver so a 9mm upper can run 9mm Colt/SMG-style magazines instead of standard .223/5.56 magazines. It’s a conversion block, not a magazine or a pistol-grip magwell.

Does it come with a magazine? No — it’s an adapter block only; 9mm Colt/SMG-style magazines are sold separately.

What is it made of? High-strength polymer with steel hardware, roller, ejector, and bolt stop.

Buy the ProMag 9mm-to-AR-15 Magazine Quick-Change Adapter Block

Order the ProMag 9mm-to-AR-15 Magazine Quick-Change Adapter Block from our Lubbock, Texas gun shop for fast shipping. Browse more AR-15 lower parts at Schaefer Defense.