To put the 10mm's performance in prospective......

The average "LEGENDARY" 45Acp 230gr HP generates around 400FPE....the 10mm average about 700FPE.

Glock 20 is the same size as a Glock 21

Glock 20 = 16rds of 10mm
Glock 21 = 14rds of 45Acp

10MM FOR THE WIN.

JYD #123 The great one formerly known as Architect.

I am now a fictional British television police officer (currently a Detective Sgt) at Thames Valley Station. My governor is Detective Inspector Fred Thursday and it’s 1969.