Doubs, Don't forget that in changing barrel calibers, you probably will have to change the recoil spring also. I just installed an original 1920s 7.65x150mm barrel on a customer's luger that was formerly a 9mm and the existing recoil spring was way too strong. Sometimes an original 7.65mm spring will work with both calibers, if you only use light 9mm loads. I've rebarreled an average of one luger a week now for the past several years, and I don't like the Gun Parts Corp barrels, since they are difficult to install and alway need a chamber ream, which is usually extra cost. If this is what you have, I'd advise sending it back for a refund before your mark it up. Tom H.
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