Mystery part sort of quiz to identify this part

[Lee Enfield]

I found this case hardened magazine follower for the WW2 BAR magazines. I sent the late James Ballou a photo, he said that Seymour thought that a harder follower would improve feeding. It really did not offer any improvement and these followers still are found in rebuilt magazines.

Also of interest is the first bipod adopted for the BAR Model 1918A1 in 1937, these are quite rare to find. These bipods were in use during the early years of WW2 until the Model 1918A2 became availableAttachment 79644Attachment 79645Attachment 79646

How close is the 1937 bipod to the R75 version?