If you have two different upper assemblies fitted to your frame, you should be able to shoot both calibers... the problem is that if the spring tension is adequate for 9mm, then the .30 caliber loads may not be strong enough for reliable functioning... If you handload, you can custom build your loads to suit the gun...
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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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