I can't answer that question about quantity but I certainly think it started in Remingtons factory and I believe part of the reason was they didn't want to be out done by the boys at Olin/ Winchester with there 21's. Upgrades seemed popular in the 70's about that time I heard someone had an Invincible built for 40K but no name was attached nor gun appeared. Finally after 47 years I'have yet to see an upgrade L.C. Smith, Fox, or Lefever or even known of 1.
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