No
No
Yes, it is. The 600AT was simply sold under the New Haven name instead of the Mossberg brand. It's a Mossberg 500A (12 gauge) intended for targets and hunting (long barrel and great wood). All Mossberg 500 parts fit it.
To determine the age of a Mossberg New Haven 600AT with the serial number H648702, you'd typically need to refer to Mossberg's manufacturing records or a detailed serial number guide. Generally, the "H" prefix indicates it was manufactured in the 1970s, but for an exact year, you should consult specific resources or contact Mossberg directly.
Yes, the 600 At is the same model as the 500 series, but with a different designation for sale in New haven stores. So yes, all Mossberg 500 after market or OEM parts will fit it.
Best left to a gunsmith
You will need to change barrel's, a accu choke is not on a slug barrel.
$175
Your western field model 35 was made for montgomery wards by mossberg.There model number is the mossberg model 30.If you can locate the breakdown of the mossberg model 30,you are in business.I would write,or e-mail mossberg.
gun shop, gun show, want ad
Mossberg
Pawn shop, gun show, want ad, gun shop