Was it bad to watch some halfwit tear off what essentially was half a blanket then laugh when attempting to pull thru' it jammed in his barrel, it was even a bigger hoot when the pull thru' snapped. I apologise...
Change in oil?
Change in flannelette?
The realisation that they had been enforcing entirely pointless rules for however long, and the expansion is minimal (otherwise you would have to use 4 x 1.5 whenever it was raining, wouldn't you)?
A DS on a recent course tried to tell me its been changed to 25mmx25mm recently. So I demonstrated to him that that size wouldnt offer any resistance or friction to a 5.56 barrel and would be competely ineffective. He walked away scratching his head.
I think some are confusing 'not more than 2.5 inches', which would equate to 48mm, (45 for cash!) with '25mm.'
Anyway. as long as there are no more than two blue lines on your flanelette, it should pull through. Even if it takes two of you!
Wasn't it 4x2 for the barrel and 4 x1 1/2 for the gas chamber ?