get a GRC, Prescision platforms (hunter) or McMillen carbon stock for your HMR and be forever happy, if your after a true ultralight rifle you will never get away from the fact that Bergara's have a heavy sporter type profile barrel (not a truck axle by any means but heavier than a Sako or Tikka sporter profile) the heavier barrel has positive side affects as well (longer to heat up if your're worried about that sort of thing and the extra weight helps tame recoil).
My 300 PRC Bergara is somewhere around 4kg with a big scope and DPT braked suppressor and to be fair it's "about right" for very comfortable shooting experience. I could happily shoot it all day without getting fatigued other than in the wallet
then again the S20 isn't exactly light either so I'm not sure it really fits the bill for what you wanted to achieve in the first place ?
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