This is not correct info. The early 146 and 640 actions WERE based on FN Mauser 98 actions, which started with full military features like a thumb cut and stripper clip guide, but transitioned to commercial features only by the early 50s. Those early 50s actions are the same as the FN Supreme, which eventually led to Browning, Interarms Mark X, etc. Sorry for dragging up an old thread, but I have a passion for these things.
The 1600 and 1900 series was an all new action that’s best described as a modified small ring Mauser 98 derivative. It’s a full length action, unlike the earlier small ring 96, and only ever sold commercially (no military use).
The 1600/1900 uses a different trigger than a 98 due to the unique safety used on those rifles. The tang has additional metal added on the right hand side to accommodate this, so a 98 trigger won’t work without some serious gunsmithing. Huber Concepts does offer a trigger for the Husky, and it’s a good upgrade over stock.
Scope rings are different than a 98 also, due to the small ring diameter forward reciever. Talley makes one piece ring/mount combos, and Leupold 1 piece mounts were also made (not sure if they still are). I think there are also options to use 2 piece bases for a 96 small ring, but you’ve got to be careful on hole spacing.
The ring diameter and extra metal in the tang affects stock fitment as well. Action screw spacing is the same as a 98, but you’ll need in letting and bedding work. Most 1600/1900 rifles also used aluminum bottom metal thats chunkier than a 98. McMillan used to inlet stocks for the 1600 action, they might still.
I’m a Husqvarna NUT. They’re beautifully made rifle, everyone I have shoots lights out, and the used market is soft relative to similar period offerings on the commercial Mauser action like FN and Browing. At the present, I’m sitting on:
Husky 640 in .220 Swift
Husky 640 in .270 (I hunt with this pretty often)
Husky 640 in 9.3x62
Husky 1640 in 6.5x55
S&W Model C (Husky 1640) in .270
Husky 1640 in .30-06
Husky 1640 in 7mm Rem Mag
Note I’m using generic 640/1640 designators as that’s pretty well standard way to refer to the different actions. The actual model numbers of the rifles changed based on barrel length, grade, and wood (1600, 1900, etc). My 640s span the transition period from military features to commercial features, with the 1947 9.3x62 being pretty close to a military 98, and the 1951 .270 being a full commercial action.
Here’s my 640 .270 with my first Colorado Muley. It wears a Hogue stock for a Mauser 98 in the field:
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