Hey all, my son recently pruchased a used 4006 .40. It's a beautifull gun, I'm extremely fond of all steel handguns.
Anyway, it only came with one magazine, (a S&W 10 round mag) with the blue plastic follower.
When a full mag is inserted in what I consider a normal fashion, with the slide locked back, slipping it in and firmly pushing up with the thumb to latch it- all is well. The slide stays locked back as it should.
But, when he starts it into the mag well and slaps it up with the heel of his hand to latch, it disengages the slide and chambers a round.
It does not do this with an empty magazine, even bashing the floor plate hard with the heel of his hand, the slide stays locked back.
Now, I consider loading a semi auto by slapping the the magazine up into the gun unwise, and I told him so, but anyone know what could be causing this?
Only ammo he has used so far is 180 grain FMJ. I think that it's a mag issue. The slide stop spring seems to have proper tension but IDK, maybe a weak spring could cause this?
But looking for info if anyone else has seen this or heard of it happening.
Thanks!