Unless you really want to add an accelerator, it really isn't needed with a new model coil mainspring. The accelerator helped the laminiated leaf spring of the old model get everything back into battery. You can accomplish the same thing in a new model with a stouter coil mainspring. That is how the 1920 carbine did away with the accelerator. Regardless, in either case a hotter round is required to cause that much reciprocating metal to function properly.
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If it's made after 1918...it's a reproduction
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