When reading up on the W3C before ordering one I didn't see anything about people having trouble bolting their actions in (except for Timney trigger clearances) but I had a couple of other problems. I just received a folding version for a R700 SA today so maybe it has something to do with it being from a new batch. If anyone else has a problem, hopefully this will save you some time.
When placing the BA into the chassis I was able to get the forward bolt lightly threaded into the action without a problem but there was a lot of rocking motion when trying to hold down he tang area. Holding it down with one hand, I was unable to get the back action bolt to thread into the tang at all. I had to use a screwdriver just to get the bolt to the top of the hole and then it would just push the tang up as I continued to turn it.
I removed both bolts and the BA and I could see that there were two points where the action and trigger were rubbing. The first area was the pin on the left side of the Timney trigger body that has been mentioned before. I used my Dremel and cut a recess for the pin. The other area was where the forward pin that holds the trigger in protrudes from the right side of the action. I couldn't move this to the left without it interfering with the trigger operation so I had to open up a pretty large area for the end of this pin to sit in. Both areas were clearly marked by scrapes in the anodized finish of the chassis where they were supporting the weight of the BA.
After fixing both of those problems I expected to be able to bolt everything together with no problems. I should have realized that needing a screwdriver to get the rear bolt to move up the hole to the tang indicated another problem since those holes usually aren't threaded. Indeed, the screw still wouldn't line up and enter the threads on the tang. I investigated several possible causes with no luck and started to wonder if the problem was with my action - maybe the distance between my bolt holes was a little off. I really wanted to talk to someone at KRG but they don't list any phone numbers on their website or in their emails so I continued troubleshooting. Eventually, I found the problem to be a small misalignment in the holes in the stock components that the rear action screw goes through. This was pushing the screw back at a small angle such that it wouldn't line up with the hole in the tang. I had to remove a couple bolts to free the bedding block and trigger guard from the rest of the stock realign the three parts. Luckily there is enough play to allow bolting it all back together while maintaining the new (corrected) alignment. After this the rear bolt slid right in all the way to the tang and threaded in easily.
When placing the BA into the chassis I was able to get the forward bolt lightly threaded into the action without a problem but there was a lot of rocking motion when trying to hold down he tang area. Holding it down with one hand, I was unable to get the back action bolt to thread into the tang at all. I had to use a screwdriver just to get the bolt to the top of the hole and then it would just push the tang up as I continued to turn it.
I removed both bolts and the BA and I could see that there were two points where the action and trigger were rubbing. The first area was the pin on the left side of the Timney trigger body that has been mentioned before. I used my Dremel and cut a recess for the pin. The other area was where the forward pin that holds the trigger in protrudes from the right side of the action. I couldn't move this to the left without it interfering with the trigger operation so I had to open up a pretty large area for the end of this pin to sit in. Both areas were clearly marked by scrapes in the anodized finish of the chassis where they were supporting the weight of the BA.
After fixing both of those problems I expected to be able to bolt everything together with no problems. I should have realized that needing a screwdriver to get the rear bolt to move up the hole to the tang indicated another problem since those holes usually aren't threaded. Indeed, the screw still wouldn't line up and enter the threads on the tang. I investigated several possible causes with no luck and started to wonder if the problem was with my action - maybe the distance between my bolt holes was a little off. I really wanted to talk to someone at KRG but they don't list any phone numbers on their website or in their emails so I continued troubleshooting. Eventually, I found the problem to be a small misalignment in the holes in the stock components that the rear action screw goes through. This was pushing the screw back at a small angle such that it wouldn't line up with the hole in the tang. I had to remove a couple bolts to free the bedding block and trigger guard from the rest of the stock realign the three parts. Luckily there is enough play to allow bolting it all back together while maintaining the new (corrected) alignment. After this the rear bolt slid right in all the way to the tang and threaded in easily.