Glock 21 conversion to 10mm?

[ReadyontheRight]

Probably a stupid question -- but since the G20 and G21 are the same frame, is there any easy way to convert a Glock 21 to safely shoot 10mm?

 

[Sean Smith]

Replace the entire top end & magazines.

 

[Lone_Gunman]

Sean, is that all you have do? In other words, is the frame of the 20 and 21 exactly the same?

 

[PO2Hammer]

The frames are exacly the same with one exeption- the ejector assembly. However most people report 100% reliability when swapping top ends. If you do have ejection problems (unlikely), that part can be easily swapped. Top ends are almost the price of a new pistol. Gotta luv those large frame Glocks!

 

[JNewell]

Just for emphasis, you will need a new slide assembly. They're available online -- but the price is significant, as noted.

 

[riverdog]

I went this route when I fell out of love with the .40SW. I bought a G-17 upper and went with 9MM. Changing the ejector is easy; buy the video and DIY.

 

[Marko Kloos]

Little piece of trivia: the Glock 21 is actually the only pistol that is a 10mm adapted for .45ACP. All other 10mm handguns on the market are either purpose-built one-caliber guns (like the Bren Ten), or .45 frames adapted to 10mm Auto (like the Delta Elite or the S&W 10xx series.)

The Glock 20 came before the Glock 21, and the G21 is a .45 based on the G20 10mm platform.