I own the PDI 6.01 242mm inner barrel and it works flawlessly in my MP7. The only other upgrade was the external 8.4 volt battery. It has never had a jam (KSC perfect bb's). And I use a silencer to cover the barrel. Check my sig for pics. The stock silecer adapter must be drilled out to allow the extended inner barrel to go through it.
I noticed a definate increase in fps and accuracy. A worthy upgrade for sure!
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