Aerotech enlarged aft closure

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r66astro

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I picked up a J420RM reload kit. It mentions "enlarged aft closure". The nozzle fits the standard aft closure. I am confused, I can not find any info on the enlarged aft closure on Aerotech website. Anyone here know anything about this?
Thanks Bill
Arcadia, Florida
 
As I recall, once upon a time the 38mm aft closures came in 2 different sizes and the smaller of which is no longer made and all reloads now work with the larger aft closure.
 
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