I have a Commercial M98 short action with no markings at all except serial number. Barrel, trigger, bolt, bottom metal and receiver are all matching number. Receiver has not been drilled and tapped. Barrel tapped for open sights. Mark X adjustable trigger and side safety. Commercial bolt shroud, no safety. Oberndorf style bottom metal with release inside trigger guard. Classic american style stock with shadowline cheekpeice, some darkish walnut. Fairly high straight comb. No checkering. Not super, but actually fairly functional. Oh yeah, the inside collar is not a "C".
Dimensions:
Caliber - 7.62 x 39 (no markings to confirm)
Receiver OAL (front of rec to back tang) - 8.46"
Ring Diameter - 1.41" (large ring step)
Ring length in front of lug - 1"
Receiver screw to screw - 7"
Front Receiver length - 2.19"
Rear Receiver length - 1.25"
Bolt OAL (tip to cocked cocking peice) - 7"
Bolt body length - 5.44"
Bolt diameter - 0.66" (rough, didn't have my calipers)
Bolt face - 0.453
Top feeding port (betwix the receivers) - 2.25
Bottom receiver opening - 2.75"
Magazine well, inside - 2.55" (this is the magazine/bottom metal)
Barrel length - 23.63"
Barrel shank length - 1.19" (measured from front of receiver to face of barrel)

So, a bit of filler info. Gun was picked up from Lever Arms in Vancouver Canada. It was sold as a Norinco out of a pile of Norinco 7.62x39 (probably JW103's). The fellow that got it did so because it had a different stock than the others (and if he had looked, I'm sure a completely different action). It appears to be a Yugo made mauser of some type. The serial number is unusual as X0001 (x being a number from 1-9). The most interesting/baffling thing is the pins that go through the bottom of the front receiver. With this long shanked barrel could this be a switch-barrel attempt? I need to take it to a gunsmith friend and see.

Pictures Mystery Mauser

What the Heck is that? Sure has horrible rough machine marks.

Interarms marketed a "Mauser" chambered in 7.62x39 in the late 80's/early 90's. They called it the Mini Mark X. I think maybe that's what you have.

Not a Mini Mark X. They are much smaller and are a push feed.

That oddball serial number has me wondering if somebodies prototype got mixed up in a shipment of Norincos - some poor little bugger in China is probably scratching his head wondering where he put that thing!

Yes that had crossed my mind. Might explain some of the rough machine work.

if you can, post a pic of it.

check the link at the bottom of my first post.

Looks like a pure custom to me...like someone shortened an action and rewelded it together...or as was mantioned......a prototype.

I agree that it's not a mini mauser...yes..they was pushfeed and this is CEF.

Looks like a pure custom to me...like someone shortened an action and rewelded it together...or as was mantioned......a prototype.

I agree that it's not a mini mauser...yes..they was pushfeed and this is CRF.

Cant tell alot from the pix , Never seen this concocktion before, Or a extended front ring that far out. Looks like a concrete truck mechanic did the barrel install

Some turkish mausers had a front ring extension that needed trimming back.

The part that has the 2 pins is very rough. Filed or ground down. It was done at some other time as some blueing is filed off as well - and the rest of the gun is fairly well finished, although rough machine marks in spots. The long front ring extension is curious to me as well.

I don't think it was chopped and shortened action. I searched it over pretty good and can see no evidence of that. I would think you could see the weld on the bolt for sure.

Wow. What a curiosity. The two pins are very odd. Could that barrel be press-fit and pinned?