Soaking them for an extended period in warm water would probably make them swell slightly, but I recommend that you put the original grips away and put some nice reproduction grips on for display... and if you are planning on shooting the Luger, don't ever shoot your Luger with the old grips... Those old grips are real prone to cracking and breaking...
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regards, -John S
"...We hold these truths to be self-evident that ALL men are created EQUAL and are endowed by their Creator with certain UNALIENABLE rights, and among these are life, LIBERTY, and the pursuit of happiness..."
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