drop in glock 17 barrel (gen 3 or 4) with matching thread cap
From lantac site:
Bronze TiALN (Titanium Aluminum Nitride) with ultra smooth hBN (Hexagonal Boron Nitride) Bore & Chamber.
6 groove, cut rifled, 1:10 Twist Right Hand, fully inspected, double honed (rough and finish) to produce a bore with a Max Roughness Average (RA) of 12.
Chambers are Match Grade SAAMI specification, precision cut and polished to a maximum Roughness Average (RA) of 16.