I have been shooting one for the last 3 years.
Like it very much. Probably one of the first one ever built in NZ.
Grant at True flight got my reamer and gauges at the moment.
You can ask him to rebarrel your ar with it but there is a $50 rental fee for it.
I shoot Berger 130 gr vld in a 1 in 8.5" twist barrel. If you want to shoot 140 gr go with the 1 in 8" twist.
Friwi
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