So what I have planned is to build a refined version of my twin hop and combine that with a LRB style set up in my SL9. The way I am planning to do this is to remove the stock outer barrel set up and replace it with a 1"x1.5" aluminum block that I will fit and modify in many ways to fit these aforementioned modifications.
I did think about modifying the stock barrel mount system by cutting, shortening and drilling out the front a nd rear sections, and removing part of the centre section that would get in the way, and then manufacture a deflection system that would pull the barrel into an upward curve in the middle, rather than either pushing up or bending the front down.
I was only discouraged from such a project due to the fact of only having 1 barrel cradle available, so if I f**ked it up I end up with a totally broken gun and there was a much simpler system to try the LRB out on IE the EBR chassis
However I have 2 questions that I think you might be able to help me with before I start cutting on this... after I can find some bar stock with the right dimensions.
1. What is the "normal" amount of movement or off-set in an LRB barrel?
When you say 'off-set' I take it you mean deflection or bend, 'off-set' when you talk about LRBs is a separate thing, it actually refers to the amount of 'step' the bb has to jump in a 'normal' LRB to produce spin, as your aware in my case, and probably yours, a TM style system is used, but mostly to hold the bb in place and give that little extra 'flick' to rise the bb.
As for a 'normal' amount of bend or deflection, it realy all depends on everything else with in the system..... barrel length, barrel material, amount of previously induced spin, bb weight, bb surface, fps, etc, etc..... this is why its so important to make the barrel bend adjustable so you can adjust the bend to balance along side all the other chosen parameters
2. What has your experience been with different barrel materials? This hadn't occur ed to me until you mentioned it in the hop up thread.
I have a SS barrel in my SL9 now that has enough length to cut and modify it for this project, but I am hesitant because if I mess up I wont have anything to revert back to.
I have a madbull teflon coated barrel in my ASR, not long enough for this project, but I have liked the performance in that applications. However, with this system I am not sure how it would do, in addition I am not sure how the teflon coating will react to a Dremel.
In my experience rougher is better. SS is not good, its just to slippy to drag the bb.
I've got a 509mm madbull teflon in the EBR as we speak as I was trying length over grip, again way to slippery and requires way more bend to be dialed in than should really be necessary. Like you I too was a tad sceptical about cutting a teflon barrel but I did however extend the hop window with my dremel and the coating seamed to stay in place