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West Hurley Semi-Auto Magazine


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Hello, I'm new to the Thompson world so please bear with me.

I've looked on the internet about the Thompson semi-auto magazine modification. It seems straightforward enough, file off 1/10" from the top of the hole. But I'm able to install the auto mag (the weapon did not have a mag when I purchased it; divorce sell, long story) as is with a little force. Should I be able to even do that? It doesn't look like the mag release has been modified. If the mag is engaging the catch as is then I'm assuming it's sitting high in the receiver causing my jamming issue?

 

Thanks for sharing your knowledge,

Reviskeev

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Don't just measure and cut... Cut a little at a time until it just locks up. Push down the magazine follower and stick a punch or something into one of holes to keep it there so that when you fit it you aren't pushing against spring pressure. You want it to just lock into place not dangle low. The same would apply if you are cutting the mag catch.
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