ECM rifling from EMAG: High-precision barrels guaranteed
Electrochemical metal machining from EMAG ECM is a high-precision technology for machining the barrels of sporting guns.
www.emag.com
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I see they are called ERC 30 and the E-Rifling type of grooves and as an upgrade they are $150 cheaper than LW barrels...I see that Skout is offering a ECR barrel on it's .30 cal