TNW Suomi M31 Impressions

I had mine apart and back together.. the barrel wiggle is just from the slotted barrel arrangement so you can swap them out.. I found it easier to get it apart if you take the trigger group out first, as the charging handle was holding up the bolt assembly from dropping out.. and if you get carried away with the tightening of that screw that holds the trigger in there, it binds up the charging handle. Everything inside is like new.
 
Found a modern online PDF manual for the TNW. Mine is still waiting at the post office, so I don't know if one is included.

http://www.tnguns.com/shop/manuals/m31manual_halfsize.pdf

Some major changes to the one I just bought from the manual

The bolt is one piece ...not 2 piece
There is only one (small) return spring...not the 2 shown in the manual

Anyone know why the receiver end cap has all the fancy holes drilled in it???

Regardless...nice,keel historic piece I can shoots anywhere
 
Some major changes to the one I just bought from the manual

The bolt is one piece ...not 2 piece
There is only one (small) return spring...not the 2 shown in the manual

Anyone know why the receiver end cap has all the fancy holes drilled in it???

Regardless...nice,keel historic piece I can shoots anywhere

Rate reducer.

but there were some special design features to reduce otherwise excessive cyclic rate of fire since model M/22. The firing-rate reduction devices were based on air compression or vacuum behind the breech-bolt, which was almost hermetically fitted to the tubular receiver.

According to the patent drawings most of the devices were too delicate and difficult to adjust correctly. The least complicated firing-rate reducer device, a simple vacuum valve, was used in every Suomi submachine gun since 1930 to ca. 1986, when last examples of this magnificent piece of equipment were assembled.

http://guns.connect.fi/gow/suomi1.html
 
trigger pull is harsh ,took assembly apart and polished it up .There were no burrs to start with ,but polished it all up ,re assembled no appriciateable change .Looked it over again (checked on web ),replaced the 1/4 "od -.030 wire 10coil spring with a 1/4"od .018 wire 10 coil spring and it lessened the pull to a little less than half of what it was and the safty is also easier to move :))) beat it around a bit and seems to stay put .Tested at the lagoon now way more pleasant to play with :)) cheers
 
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Holes in the cap

The holes in the cap are to allow air behind the bolt to egress on the back stroke and to allow air in on the forward stroke. rigrat
 
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