It's branded Grizzly Scout on the receiver, but it is in actuality identical to something called a B-1.
The ones that don't have the bleed hole give about 525fps.
There is about 2" of preload on the mainspring which is quite a bit. I had to use a bar clamp to re-assemble the action.
It has one of the sear/triggers in one unit.
The sear appears to be laminated layers of steel approximately 0.150" thick each - might be off a bit in my estimation there.
*incidentally, I once had a Geco distress flare launcher that had the hammer / sear made in the same way.*
I plugged the vent hole.
The vent hole was about 0.104"
Due to inavailability of taps, I had to dril it out to the tap drill size for 8X32
Going to seal it with loctite after I take it apart again and clean it again.
The piston has a nylon/polymer seal on it - appears translucent/transparent.
There was a lot of crap and steel chips in the cylinder near the transfer port, probably from when they drilled the bleed hole.
Stock: not bad for what it is - poorly stained wood similar to pine, came from the box with free complimentary dings but who cares.
the buttplate is pretty nice actually, thin rubber fit pretty well for a cheapo airgun.
Potential problems: the sears have been known to let go on these beasts possibly due to excessive wear on the sear.
The sear engages on a corresponding notch on a rod like extension (~7/16") of the piston.
Crosman flat-head pellets fit in there okay.
put a wad in the bore & discharged it, there was a lot of smoke in there from the left over grease/oil dieseling.
The receiver also has a short 11mm dovetail on it - seems about 3" long for optics.
The sights are pretty crude but probably will do the trick if you just sight it in for 10 metres & leave it there.
What can you expect for 40 bux.