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Old March 10, 2013, 09:49 PM   #1
barnbwt
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Join Date: May 17, 2012
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Anyone Here Own a PE57 or STGW57?

I'm looking for information on the special chamber the Swiss put into these guns. In addition to the G3-style fluting, there's an extra step at the shoulder that aids function, but I have no clue on the dimensions. I have a really good reproduction PE57 barrel in 308, but I'm set on chambering the rifle in 7.5Swiss as was intended (and so I don't have to modify anything but the reproduction barrel).

From the fire-formed brass I've seen, it looks like the step could be cut into a standard 7.5Swiss reamer to get the needed profile. I've read accounts of fluting being cut with a simple jig and a diamond burr (slow, but careful) turning out excellent results.

TCB
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Old March 11, 2013, 07:41 AM   #2
Skans
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You might check Biggerhammer.net under the Sig AMT forum.
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