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Open beta for a Subsonic 300 Blackout Long variant in the HubTN.4 series. Basically the same as the 9mmL but sized for 30cal and with some new helical porting in the endcap. Cores come in HUB as well as 3/4x16. Sleeve options are Form 1, non Form 1, and blank.
LBRY Tags: hubtn.4; ftn.4; fosscad; subsonic 300 blackout; 3d print
LBRY Tags: hubtn.4; ftn.4; fosscad; subsonic 300 blackout; 3d print