The Firing Line Forums - View Single Post - Reliability of 10mm conversion in Glock 21?

Hammerhead · September 20, 2011, 09:33 PM

Actually the 20 was under development as a .45acp when the 10mm lite came out for the FBI trials. Glock quickly changed the 20 to 10mm to get it on the market ASAP. The .45acp version became the 21 and was introduced later.

The slide on the 20 is thicker in some areas than the 21, IIRC, the holes in the end of the slide are the same size. A heavier spring with 10mm hunting loads would be a good idea. 20 or 22 pounds are normally used.

September 20, 2011, 09:33 PM	#12
Hammerhead Senior Member Join Date: May 31, 2004 Location: Minnesota Posts: 2,432	Actually the 20 was under development as a .45acp when the 10mm lite came out for the FBI trials. Glock quickly changed the 20 to 10mm to get it on the market ASAP. The .45acp version became the 21 and was introduced later. The slide on the 20 is thicker in some areas than the 21, IIRC, the holes in the end of the slide are the same size. A heavier spring with 10mm hunting loads would be a good idea. 20 or 22 pounds are normally used. Last edited by Hammerhead; September 21, 2011 at 03:56 PM.