FX used yet another different thread size

This is getting very frustrating trying to make anything for the FX air guns. I was given the size to make an LDC for an owner of an Impact, 27mm x 1.25, he said it fit perfectly. So I have been making them that size for Impact owners, today I get an e-mail, the threads are too big, FX has now used yet another size of thread on the Impact, I would like to know what on earth is going on at FX, why are they constantly changing the thread size and pitch on the ends of their guns? It is bad enough having to deal with this on the Wildcats, but now makers have to deal with different threads and pitches being used on the Impacts, come on FX it is time you used a standard size threads on your shrouds. Is there an Impact owner out there who knows what this other thread size and pitch is? It looks like it might be 26mm threads and not 27mm but I have no idea what the pitch is, Neil.
 
"NeilClague"...but I have no idea what the pitch is, Neil.
Must have been a curve ball. : ) Not much help, but I hope you don't mind a little humor. Do you think it just marks a new production batch that maybe includes tweaks on previous issues. If so it would be interesting if everyone that received the new pitch also had less glitches.
 
I don't know what is going on with FX, I went through this before with them changing the threads on the Wildcats. Frederick told me they had standardized the threads now, well it would be nice if they did that on all of their guns and not just some of them. Why they would go from 27mm to 26mm threads is beyond me, if they want to standardize threads why not use the same 20mm threads they use on their other guns, why introduce yet another different sized thread? And no I don't mind the humor, sometimes it takes a bit of humor to prevent us from losing our sanity over things like this!