Arisaka "AIR RELEASE RIFLE" that looks like a type 30 or 35????

Two questions:
1) Has anyone come across of a T30 or T35 Arisakaicon with the characters that translate to "Air Release Gun" and no Emperor's stamp?
2) what were the markings on the so-called 02-45?

I am in the market for a T30 or T35 Arisaka (or both).

I recently came across a very nice looking but odd T30 or T35 Arisaka rifle at a very decent price, but I passed on it for the following reasons:
1) stamped markings were the characters that translate to "Air Release Gun" and there was no Emperor stamp (it was not ground off, it just wasnt there);
2) no other markings indicating Type. but it was a Tokyo Koshikawa factory stamp and serial number that I believe paced it as pre-WWI;
3) The listing showed a tag labeling it as a Type 35, but the pics showed it had a Type 30 rear sight (typical of the so-called 02-45?);
4) the mud cover grooves were not present (also typical of the so-called 02-45?)

Everything else looked correct for the T30 (hooked safety, aforementioned rear sight, stock, etc.)

Any thoughts? Should I regret not buying it? ...wait, dont tell me! ;-)
Attachment 128142Attachment 128143Attachment 128144Attachment 128145Attachment 128146

Interesting photos. Five different guns?

??? Same gun!

Bolts and receivers don't match. Rear sights don't match.

The first four photos are of a T-30 rifle that was removed from military service and converted to a smooth bore training rifle.
The original receiver T-30 markings and Chrysanthemum were removed and re-stamped with the characters on the receiver top that translate to "Blank Firing Gun".

The fifth photo is not the same rifle. Hope this has been useful.

didnt notice that I included an M38 in the pics. That was the the cause of another mystery post also since solved in the Soviet Forum.
As far as I can determine, according to "Military Rifles of Japan" the rifle was never stamped with a MUM, but was originally stamped with the three characters above. The barrel may never have been rifled either, but that is academic.
MYSTERY SOLVED, thanks all!

With the quality of the rifles, and a larger serial number (above 3 digit), these were originally standard issue T-30 rifles with proper receiver stamps, including the Mum. The receivers were ground off and re-marked as shown when fully converted to training use.