Hi Lewis.
my R1 Has been retrofitted with a Theoben ram at Beeman in HB, Ca. Back in 2003.
I purchased this .20 R1K brand new in 5/97, and several years later wanted to increase the power a bit. My airgun guy suggested having him send it back to Beeman for the Theoben gas spring as he called it. So we did. That was March 2003
I have not had the ram out of it since it has returned from Beemans facility.
So just short of 19 years and still going strong. As near as I can tell, it looks like the ram you show as I can see some milling marks in the groove that the shoe slides in.
The paperwork from Beeman is seen in the third picture
I like the shot cycle of the gas spring guns
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