I'm not sure sending the weapon back will do anything. This is a Military Combat Rifle, designed to shoot military Spec. ammo.
Anyone who is buying the gun and shooting commercial .223 may get the odd slam fire every now and then.
This is the same problem that happended with the FN FS2000 when it was introduced into the US civilian market. FN made upgrades to the FS2000 fire-ing pins to allow for shooting commercial .223 ammo. IWI may take the same action but then again maybe not.
Why is anyone surprised that a rifle with a floating firing pin may get a slam fire? It does happen with others including AR's and M16's. They are rare and in my experiences they are partly due to worn parts and .223 ammo. I've had slam fire's with AR's and with an M16 A1. They do happen and I don't mean to insult some of the poster's here but if you haven't experienced a slam fire then you haven't spent as much time around AR's and M16's as some us here have (it may also mean that your weapon and ammo is consistent and in good shape, as it should be, if this is the case good for you).
News flash, I have had slam fire's with an Steyr AUG. Steyr upgraded the AUG's firing pin a while back and guess what, included a captive firing pin spring on the firing pin. This was to allow for the uses of commercial .223 ammo.
Now I get to plug HK, for all the HK fans out there. I have never seen or heard of a slam fire with a HK SL8 or G36. Must be superior German engineering. And guess what; when HK updated the outdated AR15 / M16 they included an "firing" pin spring.
Rich LPS
P.S. No slam fire's with Swiss Arms / SIG's: the best Combat rifles in the world. I didn't say the lightest, just the best.