I don't know how Steyr manufacture their barrels rifling but if they're buttoned or hammer forged the immense forces used in these processes gives the barrel steel a kind of slightly stressed grain pattern and outer/inner 'skin', when you machine such a barrel you relieve stresses in the grain pattern and skin which can distort the bore and crown causing inaccuracy.
http://www.firearmsid.com/feature%20...anufacture.htm
Considering the risk and cost of Steyr barrels (about 4 or 5 times the cost of my HW100 barrel) I'd stick with the Steyr silencer adaptor.
Originally Posted by Gunfun
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