Quote:
Originally Posted by tankdriver
Round hole is for the early M18(US number) scope, the square hole was for the battery for the lighted reticle.
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Not according to the manuals. The 57mm M1 gun used a bigger box so you're probably correct for that. The M18 scope is over a foot long though isn't it? Not sure how you fit that in a 6" high box....
The 6 pdr box had the small spare springs and pins box in the square hole, what went in the round hole? It's not deep enough to take a firing pin spindle and it's not clear what the larger rim is for.