Since it looks like trunnion mounted stocks are not going to be an option any time soon, if at all....
Has anyone considered using an offset/eccentric shock mount bushing to effectively shorten the shock side leverage of the pivot by 2mm? I'm still trying to work out the actual numbers, but some rough guestimation puts it right around 107 mm travel. Dropping to 6x22 hardware would allow for 110mm travel. Sure its not the full 120, but for relatively little money, it gets you half way there.
Any thoughts or concerns about trying this?
https://www.offsetbushings.com/collections/all/products/offset-bushingEDIT:
I decided to pick up some 1/2" round aluminum bar stock from amazon for $5. I'm going to drill and tap a hole, as offset as possible to maximize the increase in travel. I think I can get a little closer to the edge by bolting right into it, rather than drilling with a larger hole for the normal 8mm hardware to go through. Hope that makes sense.
Anyway, if I get bored one rainy day, Ill see if I can fabricate something up. Or I may just decide its not worth the aggravation for a measly 7 to 10 mm extra travel.