Read the C-1 stock was designed by the famous custom stockmaker Gary Goudy for Beeman. I think the difference in this stock is it’s obvious straightness, but also it’s grip thickness. I compared it to my early Webley Mark 3 in pics below. The Mark 3 is much thinner and can be more easily gripped like a pistol with arm lower. What the C1 stock makes you do is hold the rifle with your right arm straight out? Puts your hand more over the stock and does keep this pretty powerful carbine more stable? This may actually give me better form, but the rifle seems to be more accurate than it should be. I also find the single stage triggers of these two Webleys to be pretty similar.
https://imgur.com/a/NshlMXx