Just wondering if there's much of a velocity difference between 5" rifled and 4.6" polyagonal barrels.

from what I have chronoed its from 0 fps to about 35fps.

hope this helps

Jason

Individual pistols will vary more. I have found the claim of higher vel. in polygon rifling marketing hype. At best you might see 10-15fps increase over a comperable length conventional bbl. I replaced the factory bbl. in my G17 for shooting lead & it actually gives slightly higher vel. than the factory.