afaik, that isnt a feature on real steel 1911's as well
you should be able to manually decock a 1911 styled pistol completely and not have it stuck in the half-cock position
I believe WA is the only company that lets you do that with their airsoft guns
KSC tends to poke the valve a bit and vent some gas if you lower the hammer like that
anyway, it sounds a lot like fitment issues
when fitting the blowback chamber, rack the gun back and forth while screwing the allen key in the back in, there is a "sweet spot" that the screw has to be in; most of the time, it will not be screwed in super tight, but tight enough
leave it in the sweet spot where the gun still has smooth slide movement while at the same time the chamber being securely fastened
if this doesnt work, remove everything from the slide, make like a cabinet, and start filing
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