I've said it before and I'll say it again. You'll get nothing for nothing...Yea their folder alone is a pretty penny considering you can get the entire W3 chassis for a trg for $50 more for non folder and like $150 more for a folder. My plan was a full W3 chassis if I found a "cheap" trg22 as a donor. There is one in the PX I was ready to pull the trigger on but he didn't have the trigger guard which you need. Couldn't source one as a replacement.
The KRG stocks are copies of the TRG with modifications. They build off of a main rail to which other component are bolted on to.
The KRG folder is excellent and folds to the left due to interference with the bolt handle.
Most KRG accessories will fit the TRG main rail with a bit of work. Not everyone will be able to modify or manufacture the parts to do this, so KRG reply with a "No" when asked.
(I've put a KRG enclosed forend for a Tikka (CTR version) on my 22. Pics in thread IIRC)
If you have a TRG, IMO there is no need to buy a complete KRG chassis. Just buy the folder and a forend. There will be some work to make the forend fit, but nothing that will deterr me (IMO).
@FUNCTIONAL
Was it the TRG that was missing the trigger guard? The KRG uses the TRG's.