Convert Glock 20 to shoot 45ACP

[General Tso]

Can I shoot 45's in my Glock 20 by getting a glock 21 barrel and g21 mags?

 

[matai]

I think you need a whole new slide, but its the same frame.

 

[davidalyn]

The 10mm breach face is smaller that the 45 ACP breach face. As was mentioned above and new top end (slide, barrel, etc.), a 40/10mm extractor and 45 ACP magazines.

You could buy a new Glock cheaper than attempting the conversion.

 

[NG VI]

If you had a 21, you could convert it to 10mm with a heavier spring, the slide of the .45 is lighter than the 10mm, so you really should compensate for it with a tougher spring or refrain from heavy loads.

 

[NMGonzo]

I think you need a whole new slide, but its the same frame.

You could splurge and get a .45 acp barrel to go with it