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Harrington & Richardson (H&R) the maker of the Topper shotgun, was located in Worcester Mass.
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1979
1970serial#72681
find a replacement barrel and cut to the length you want
The Topper 88 was designed as a shotgun. If somehow the barreles do fit, I would not fire it unless my medical and life insurance were paid up.
(48 hr) * (1/5) = (48 hr) / 5 = 9.6 hr --> 9 hours, 36 minutes
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50-160 USD
(48 mi / hr) x (5,280 ft / mile) x (1 hr / 3,600 seconds) =(48 x 5,280 / 3,600) (mi - ft - hr / hr - mi - sec) =70.4 ft/sec
4 hr and 21 min
10-100 USD or so