Yes. Both the No.1 and No.4 rifles have a relief hole drilled into the left side of the receiver ring to vent gas in the event of a ruptured primer or case.
Many books have been written on the Lee-Enfield. Good luck.
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9 lbs
Entire books have been written on Lee Enfield Rifles. You'll have to narrow it down a little. A Wikipedia search for SMLE will help you get started.
See the link below to a good Wikipedia article on the Lee Enfield. There are several DIFFERENT .303 Enfield rifles.
1917 lee enfield
SMLE- aka the Lee Enfield
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The 'E.Y'. rifle was named after Sir Ernest Youlle who invented it, or more accurately, adapted it from the standard Lee-Enfield rifle
See the link below for a short treatise (with photos) on the various Lee Enfield oilers.
Poison Gas (chloride and mustard): The Tank:The Aeroplane: Flame Throwers, submarines/u-boats, Lee-Enfield Rifle
The Lee Enfield is a Controlled Round Feed rifle. The Lee Enfield Rifles (SMLE and other later versions for example the NO4 Mk1 and 2) are all Controlled Round Feed. The Lee Enfield bolt controls the round as soon as it comes out of the magazine. This prevents double feeding etc. Controlled Round Feed does not require a long non-rotating extractor, however that's the feature of the best known ones like the Mauser and its derivatives.