"The ONLY one to pass the [CHiP] durability test was the Glock 20. All the rest suffered broken frames."
Sorry, no.
First, the CHiP durability test consisted of sustained firing -
5000 rds - of 175gn Winchester STHP (@ btw 1250-1295fps).
Second, only a
proto-type G-20 was available for testing, and Glock protested to CHiP that this proto-type had not yet completed Glock's
own durability trials when CHiP set the deadline for entry of candidate 10mm pistols. Too bad, said CHiP. So, rather than not send one at all, Glock sent a not-so-extensively-tested proto-type. The results were predictable.
As John Taffin* reported it in 1991 (directly from the CHiP testing records):
Glock: "Firing was halted at approximately 3,800 rounds because of severe cracking and deterioration of the bolt face at the firing pin opening which caused repeated malfunctions. Additionally, upon final inspection of the weapon, cracks were found in the plastic frame rails adjacent to the magazine well at the rear of the barrel locking lug."
Actually, those of us who own a G-20 today are beneficiaries of this particular "
failed" 10mm pistol.
Why? Because Glock took back their proto-type 10mm, even though badly mauled by the Win. STHPs, and had their engineers study closely what happened to those battered parts. They then incorporated design improvements (mostly thru strengthening certain areas) in the bolt, frame and slide and put it thru their own trials (again), and it successfully finished Glock's testing thru sustained firing of hot Norma-strength 10mm. (And it was from the G-20 that the .45 acp G-21 was derived).
The G-20 was
literally built - or rebuilt - from the ground up to handle the full-power 10mm Auto, in part at least, from what was learned from the CHiP tests.
No doubt about it. Today's G-20 would've passed the CHiP durability test. But whether it's grip-circumference would have been an issue for smaller-built CHiP surfer girls & guys is a different question.
Third, here's a pop quiz: which of the submitted pistols actually passed CHiP's durability test?
The Smith 1006, of course.
Big. Heavy. All steel. American made. Best of all, it's
pre-sellout.
Taffin notes:
"The 1006 was the only double action semi-automatic to make it through the CHiP tests ..., an amazing feat. It was rejected not on performance but for having excessive recoil."
Well, sustained-firing of 5000 rds of hot 175gn STHPs probably will turn surfer dudes & dudettes into snivelling wusses. So what else is new?
As to the 1006's specific performance, Taffin relates this from the testing:
"The Model 1006 fired 3,500 rounds with no malfunctions and then required cleaning due to debris buildup which caused 6 malfunctions. The pistol was cleaned and oiled, then fired to over 5000 rounds. The weapon suffered no parts breakage."
By the way, during testing CHiP used a "malfunction rate" standard of 1 in 100 or better as part of its evaluation.
Reported malfunction rates were:
Colt Double Eagle: 1:18;
G-20: 1:19;
S&W 1076: 1:500;
S&W 1006: 1:844.
Hope the above clears up any confusing internet "myths".
*Taffin article in the 1991 Annual, American Handgunner, Special 10mm Issue, pp 57-58.