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Problems with striker mk4…

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Bruce2160 View Drop Down
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    Posted: February 06 2026 at 3:13am

he!!o,

I shoot a Lee Enfield .303 Mk4 with great enthusiasm. Unfortunately, I have had major problems removing the firing pin (“striker”). The threaded joint is seized in the cocking piece, and turning the striker is virtually impossible. Several wrenches have already been ruined. (The locking screw in the cocking piece has, of course, been removed.)


Good advice is hard to come by, especially since Mk4 strikers are currently not available. Any help is very welcome, as the rifle shoots excellently…

Thanks Bruce
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: February 06 2026 at 9:30am
Many of the aftermarket tools are rubbish.
Many make their own by grinding down an appropriate sized long neck socket!

Don't shoot till you see the whites of their thighs. (Unofficial motto of the Royal Air Force)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Sauron Quote  Post ReplyReply Direct Link To This Post Posted: February 06 2026 at 12:55pm
I'm assuming you've doused it with penetrating oil?  

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Zed Quote  Post ReplyReply Direct Link To This Post Posted: February 06 2026 at 1:44pm
I assume this is a No4 Mk1 rifle. 
Some heat applied to the cocking piece, would be worth a try. If that doesn't work, you may need to cut the firing pin and replace both. I would recommend changing the spring as well as the firing pin and cocking piece. 

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Post Options Post Options   Thanks (0) Thanks(0)   Quote A square 10 Quote  Post ReplyReply Direct Link To This Post Posted: February 06 2026 at 3:18pm
i was curious as to the mk 4 comment as well , - is it a 22cal ? 
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Bruce2160 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bruce2160 Quote  Post ReplyReply Direct Link To This Post Posted: February 06 2026 at 3:25pm
Thank you for the advise. Seems like cutting the pin is my last issue. Unfortunately it is very hard to find a pin available in  stock.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bruce2160 Quote  Post ReplyReply Direct Link To This Post Posted: February 06 2026 at 3:26pm
no, it‘s in 303…
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Post Options Post Options   Thanks (0) Thanks(0)   Quote A square 10 Quote  Post ReplyReply Direct Link To This Post Posted: February 06 2026 at 4:15pm
then it must be a no4 - not a mkIV - these terms make a huge difference here , i wish you luck and suggest that the soak in kroil and maybe the heat might be a good thing to try , 
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