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The Saint · February 2nd, 2009, 17:28

Assuming proper manufacturing and installation, switching to a tightbore will improve grouping without also having to switch to a tightbore that's longer than your stock inner barrel.

Generally, people don't cut down inner barrels. They find and settle for the length nearest to their needs. Inner barrels are manufactured at lengths equal to stock inner barrels for different guns. If you need an inner barrel that's longer than any for MP5s, you can use lengths meant for M16 or AK or whatever.

If you feel the need to get a longer inner barrel, basically any length will do provided you keep under ~650mm (to avoid needing a boreup kit) and have a matched cylinder to provide sufficient air volume.

February 2nd, 2009, 17:28	#2
The Saint Trader rating Join Date: Jan 2005 Location: Quebec	Assuming proper manufacturing and installation, switching to a tightbore will improve grouping without also having to switch to a tightbore that's longer than your stock inner barrel. Generally, people don't cut down inner barrels. They find and settle for the length nearest to their needs. Inner barrels are manufactured at lengths equal to stock inner barrels for different guns. If you need an inner barrel that's longer than any for MP5s, you can use lengths meant for M16 or AK or whatever. If you feel the need to get a longer inner barrel, basically any length will do provided you keep under ~650mm (to avoid needing a boreup kit) and have a matched cylinder to provide sufficient air volume. __________________ "The Bird of Hermes is My Name, Eating My Wings to Make Me Tame."