larryccf
Contributing member
this only applies to the USP Series HK pistols and pre 2003 SIG pistols
For years i'd read on the web, the web wisdom that the Glock pistol was quieter when suppressed with the same suppressor than either the HK or the SIG. And foolishly, i accepted that "web wisdom". It was not until after we started the CCF RaceFrame project of manufacturing metal replacement frames for the Glocks that I learned different. That "web wisdom" was based on false knowledge that the Glock's action stayed locked longer, thus preventing noise escaping out the ejection port. It was during the RaceFrame development , and we were exploring the cause of the Glock "kabooms" that everybody attributes to the unsupported case. Well, i don't doubt the unsupported case exacerbates the kaboom issue, but it isn't the cause of it.
Take a glock, cleared of all ammo, and pull the slide back a hair - and i mean a thin hair. The barrel starts to unlock from battery or the slide and dropping down within 10-15 thou of travel rearward. Surprisingly, if you pull the trigger, it will release the striker for a considerable amount of travel. Frank Di Nuzzo, who was chief armourer & firearms instructor at Glock USA for 13 years, told me the standard frame glocks (17/22/24/31/34/35 & 37 ) would fire out of battery up to 55 thou of travel.
To me that's a big safety issue. Do the same with the HK USP series pistols or the SIGs, and the barrel doesn't start to unlock from battery and dropping down for about 100-110 thou of travel - the HK USP will still fire for about 50-55 thou of travel, but keep in mind the barrel is still fully locked in battery. Then for the last half of it's 100-110 thou of travel, the HK will not release the hammer, even though the barrel is still in battery. That's a big safety plus to me. The SIGs were similar in amount of travel before they started unlocking and how far they'd travel and still be able to fire.
Think about the glock, if there's powder fowling in the chamber keeping the round & barrel from going forward into full battery, but still being able to fire - now there's even more of the case exposed unsupported.
But the HKs and the SIGs staying locked longer made for a quieter sampling on the suppressor sound level.
FWIW
For years i'd read on the web, the web wisdom that the Glock pistol was quieter when suppressed with the same suppressor than either the HK or the SIG. And foolishly, i accepted that "web wisdom". It was not until after we started the CCF RaceFrame project of manufacturing metal replacement frames for the Glocks that I learned different. That "web wisdom" was based on false knowledge that the Glock's action stayed locked longer, thus preventing noise escaping out the ejection port. It was during the RaceFrame development , and we were exploring the cause of the Glock "kabooms" that everybody attributes to the unsupported case. Well, i don't doubt the unsupported case exacerbates the kaboom issue, but it isn't the cause of it.
Take a glock, cleared of all ammo, and pull the slide back a hair - and i mean a thin hair. The barrel starts to unlock from battery or the slide and dropping down within 10-15 thou of travel rearward. Surprisingly, if you pull the trigger, it will release the striker for a considerable amount of travel. Frank Di Nuzzo, who was chief armourer & firearms instructor at Glock USA for 13 years, told me the standard frame glocks (17/22/24/31/34/35 & 37 ) would fire out of battery up to 55 thou of travel.
To me that's a big safety issue. Do the same with the HK USP series pistols or the SIGs, and the barrel doesn't start to unlock from battery and dropping down for about 100-110 thou of travel - the HK USP will still fire for about 50-55 thou of travel, but keep in mind the barrel is still fully locked in battery. Then for the last half of it's 100-110 thou of travel, the HK will not release the hammer, even though the barrel is still in battery. That's a big safety plus to me. The SIGs were similar in amount of travel before they started unlocking and how far they'd travel and still be able to fire.
Think about the glock, if there's powder fowling in the chamber keeping the round & barrel from going forward into full battery, but still being able to fire - now there's even more of the case exposed unsupported.
But the HKs and the SIGs staying locked longer made for a quieter sampling on the suppressor sound level.
FWIW
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