I do see two hex screws - are the two in the photo the ones you are talking about.

in the Serial# after they redesigned or was that just something that showed the update was done? Again - mine has NO dot (.).

If there are two hex head screws, one on each side, and below the lower firing pin, the updates have been done. The best test is to look at the face of the surface where the firing pin holes appear in the breech with the barrels removed. This marking is very easy to fake so do not rely on it alone. A frequent task for the crime laboratory investigator is the restoration of serial numbers or other markings which have been obliterated from metal objects. Remington 870, 700, 1100 Serial/Barrel Number Lookup. It is very easy to use, it uses information from the Remington company. It will show you date of manufacture of your firearm. You can tell if the gun you are looking at has been upgraded in the receiver by a period or dot between the serial number and the 'OU' on the under portion of the receiver - sample being OU.12345. Remington 700, 870 or 1100 serial/barrel number lookup will work with Remington 700, 870 or any other Remington shotgun or rifle. The upgrades never were a safety issue, just issues with the basic receiver mechanism and wood damage. If is has two pins it came from the factory before they fixed the problem. If your gun has one pin on the side of the receiver it has the update from the factory.

Remington 3200 serial number lookup