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yeah im saying i was wrong initially, i checked my own and it is 5mm as you said?

oh well it is indeed 5mm.

I definitely recommend the use of a 3/16” (4mm) punch. It fits super snug, won’t chip the thread and works best. ATENTION!: Before trying to remove the stock, open it up full length or the thread will work against the stock.

As a new owner of Supernova Tactical I was having the same issue, solved now thanks to you @Vertigofirearms and @Jeff in CO - got myself a punch set. One note though - the nut in my Supernova has holes 5mm (3/16") wide, 4mm (5/32") punch was too small. Hope it helps someone out.

Sorry to be that guy.... Buuuut.... trigger discipline.....

I got my M4 H2O 2 weeks ago by sheer dumb luck at a nearby Cabelas ( 15 miles away ). My Cabelas doesn't even list the M4 as something they carry. I saw a regular M4 in stock on my area BassPro website a few months ago, but hesitated and it was gone. Their order online/pickup in store option was not available at that point either. I considered their waitlist option but decided not to bother. I got the list of my local dealers ( north of Atlanta ) off the Benelli USA website, contacted each and every one of them, and came up empty. I sadly drove to Cabelas 2 weeks ago for my plan B: Immediately get a .45 ACP pistol for home defense ( weak substitute for an M4 ), a 9mm pistol for an eventual concealed carry/backup, and an M4 in the future if/when available. As luck would have it, Cabelas was out of the pistols I was interested in, not even counter models to pick up and evaluate. I was disappointed that I had wasted a trip, and when I mentioned my plan B to the guy at the counter he said "I have the H2O version of the M4 right over here, want to take a look at it ?" Stunned, all I could say was "Um, yeah!" Needless to say, I bought it right then and there.