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No 4, Mk 1 Headspace

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105GunGrunt View Drop Down

Joined: February 08 2020
Location: California
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    Posted: February 13 2020 at 9:44pm
I just acquired my first Enfield rifle, a BSA No 4 made in 1942.  Serial # Q3943.  5 land and groove barrel with about half of its life left. 

The rifle has a #3 bolt head installed.  It closes on a NO-GO gauge.  My gunsmith happen to have another No 4 in his shop that had a #1 bolt head.  We replaced my #3 with the #1 and it wouldn't close in the NO-GO!  This made no sense until I read a terrific post on this forum by Alan de Enfield.  It seems #3s are not always bigger that #2s, or #2s longer than #1s.  It appears the length of a #3 is not consistent across manufacturers of Enfield No 4s.  I put the #3 back on my rifle and fired 5 rounds.  An inspection of 5 rounds fired show no protruding primer and no issues with the base of the brass.  I took the 5 cases to my local gunsmith (who did the NO-GO test) and he said they looked great.

Any thoughts or comments?
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