Glock 21 and 45 Super?

[Dashunde]

I've been thinking about buying a 10mm barrel for my Glock 21 figuring its about as powerful as (inexpensive) auto-loaders can be.
That would require a aftermarket barrel, magazine from the G20, recoil buffer and a stiffer spring.
Total is around $170

Then 45 Super caught my attention... According to Buffalo Bore's info, its energy levels (ft/sec & ft.lbs) is right there just a hair behind the 10mm, and as a bonus the ammo is less costly.

Can I run small amounts of 45 super through a stock G21 barrel after only installing a ~24lb spring & aluminum guide rod plus a recoil buffer?
Totals around $45 - Seems like a much more cost effective way to get close to 1200fps & 700 ft.lbs.

 

[Dr_Rich]

Just from a price point, the 45 super seems like a good option. Would you be able to shoot standard .45 in that set up? Seems like it would be a lot of work for a regular 45. If not, then both of them would require you to swap parts.

 

[kcub]

I have a Colt .45 Super. You can also shoot standard .45 acp without changing anything.

 

[chris in va]

Don't forget, you'll have to chase that unique brass if you reload.