Primary Machine P07 Guide Rod Fluted w/ 15lb Recoil Spring Titanium Nitride Gold. They are non captured to make swapping recoil springs a much faster process. We recommend a 15lb recoil spring as OEM weight tends to be over sprung. Specifications for Primary Machine CZ Guide Rod Fluted: Manufacturer: Primary Machine Gun Make: CZ Quantity: 1 Condition: New Additional Features: Fluted Included Accessories: 15lb Recoil Spring Features of Primary Machine CZ Guide Rod Fluted Material: Stainless Steel Captured: No Package Contents: Primary Machine CZ Guide Rod Fluted What firearm models does the manufacturer say Primary Machine CZ Guide Rod Fluted is compatible with? The manufacturer suggests that Primary Machine CZ Guide Rod Fluted is compatible with CZ P-10 C CZ P-09 Duty CZ P-07 DutyPrimary Machine P07/GUIDEROD/TiN/15: P07 Guide Rod Fluted w/ 15lb Recoil Spring Titanium Nitride Gold