We're type 99 stocks miss matched with recievers during the war?

[jangle]

well, the post is kind of 2 questions.

Did the Japanese sometimes miss match stocks with different receivers during the war and also, do you think some Series 6 Arisakas had that latch for the cleaning rod?

No and No to your question.
By this time at the Toriimatsu factory, the 6th series rifle stocks were set up for the 2 screw front band with the round cleaning rod retainer and no drain holes at the middle of the stock. As mentioned above, you will sometime encounter the rear band with the mono-pod lug on the bottom, but the mono-pods were deleted by very late in the 4th series.
There is always an anomaly with Japanese weapons, but you usually see the early parts showing up in late manufactured guns in mid 1945, not when your 6th was made.

James A