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How are the latest G21 and G20 Gen 4 models?

979 views 17 replies 10 participants last post by  BrthrB 
#1 ·
I'm considering a G21 or a G20 Gen 4 and am wondering if the problems that some of these Gen 4 models had are now a thing of the past?

Current production G21 Gen 4 - good to go for defense reliability?

Current Production G20 Gen 4 - good to go for defense reliability?

OR... will either of these be more reliable, still, in their Gen 3 version?
 
#6 ·
The challenge with the G 20 of any variant is the extremely wide range of ammo available. You can buy or reload ammo from near 9mm specs to almost 41 mag specs. (I said almost) The G 20's come sprung to shoot factory 10mm ammo. If you want to shoot the uber hot Buffalo Bore, parabellum research etc, you may need a stainless RSA with at least a 20# spring, if not 22# or 24#.
 
#7 ·
Good to know.

What's the factory supplied recoil spring weight?

It seems the typical factory 10mm ammo is running around 1100-1200 fps for 180 gr. Is the stock spring well matched to those velocities?

BB is in the 1350 fps neighborhood for 180 gr.
 
#11 ·
Not sure it helps it's just one case, but hey a little better than speculation ;)

I bought a Gen 4 20 about 18 months ago, even a trip to Glock would not make it run with full power ammo. Tried heavier springs, no help. Sold it and moved on as I had no time to play in that apparent rabbit hole.

Bought a new gen 4 20 about three months back. It runs like a top on the exact same underwood ammo that choked the previous one.

Like I said, sample of one, could have been the luck of the draw but waiting a bit worked out for me.
 
#12 ·
Is there much consensus as to whether to lean toward a G20SF vs. a G20 G4?
I believe that Gen 3 G 20SF is sprung @ 17#. ref the difference, I have Gen 3 SF variants and Gen 3 in the same. If I had it to do over, I would pick a Gen 4, unless the Gen 3 SF model was more than $100 cheaper.
 
#16 ·
I bought my G20 Gen4 on 09/18/2014. It had a born date of 08/27/2014. I’ve run every thing from weak range ammo to hot Underwood and Buffalo Bore +P loads with zero problems. I’ve never even considered replacing the RSA.
 
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