Inside diameter of LDC question

What I have is a FX Royal 400 in .22cal great gun but when I purchased it (one year old) it had a bad breach seal (o-ring) I heard it's easy to replace if you put a cleaning rod in from the muzzle to help work the o-ring into place, Ok here's where things get interesting my steel .22cal cleaning rod will just barley fit past the first baffle but the second one is a no go, I resorted to draw filing the end of the cleaning rod to where it would just barely fit through the second baffle (snuggly) the others were no problem. 

I called and talked to the FX Tech, he disgusted with the other Tech and neither one really knew what the correct size should be, because it is shooting so well we came to the conclusion of if it wasn't broke don't fix it. 

Final size of cleaning rod

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Size of pellet head

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And size of pellet skirt

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I would think that if it's a .22 the baffles would at least be larger than .22, I'm pretty sure this is the stock LDC 

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Looks like the female end of your cleaning rod is "out of round" . Maybe edge is catching on baffle. Just a thought. Looks like a stock Royale shroud to me but don't know if inside configuration is original. Never had problems getting cleaning rod through my shrouds or baffles (FX Royale 500 & FX Boss). Good luck, DON'T force it. (Rotate end of rod in caliper & see if reading changes)