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Muzza

Inner barrel dimensions

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Just bought a metal barrel & silencer kit for the H&K UMP 45. Being so this has made it possible to fit a longer inner barrel. the Factory one is around 200mm, i'm looking for 300mm but im not sure on the width?

Can anyone help with this. Some guy on youtube had a 6.01 tight bore but he had swapped out his plastic hop up unit for a ally G36 one... bit confused here. Any help welcome.

cheers

 

Muzza

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6.01 is good for short range accuracy. 6.03 is the most common barrel width for outdoor use. expensive barrels 6.05 barrels are best for longer range

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Cheers,

 

I'll go for the 6.03.

 

Muzza

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However this is all down to certain variables, but 6.03 is a good middle ground

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