Feel free to send me an email at contact@criterionbarrels.com for larger volume pricing information. I would be more than happy to provide a quote based on your level of demand.
-Josh
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SMLE barrel models are also in the works. I don't have an ETA as of yet (it depends on how many dimensional changes are required on the breech end), but they should be following shortly behind the No.4 barrels in the production schedule.