Herrington Arms HA Fluted X Carry 3.9in Guide Rod Assembly Black. 9" Sig Sauer P320 slides. This guide rod allows you to run it with a supplied set screw and leave the end open or install the screw and make it captured. This system will let you replace the factory captured recoil spring and allow for easy and optimal recoil tuning. This makes an excellent addition for the use with compensators as well as tricky ammunition like frangible or hand loaded ammo. Specifications for Herrington Arms HA Fluted X Carry 3.9in Guide Rod Assembly: Manufacturer: Herrington Arms Color: Black Finish: Nitride Fabric/Material: 7075 Aluminum Gun Make: SIG Sauer Gun Model: SIG Sauer P320 Features of Herrington Arms HA Fluted X Carry 3.9in Guide Rod Assembly This kit is ONLY compatible with the following models: Sig Sauer P320 Compact M18 P320 Legion Carry P320 AXG P320 Spectre Comp IMPORTANT: Will NOT fit X-Five X-Five Legion M17 P320-F AXG Pro P320 Full X-Full or any other models/ custom builds with a FULL-size slide. Package Contents: Herrington Arms HA Fluted X Carry 3.9in Guide Rod Assembly 1 BLACK NITRIDE FLUTED GUIDE ROD 1 BLACK NITRIDE COLLAR 4 HIGH QUALITY FLAT WIRE RECOIL SPRINGS (12lb 14lb 16lb 18lb) 1 NITRIDE COATED SET SCREW 1 NITRIDE COATED CAPTURE BOLT What firearm models does the manufacturer say Herrington Arms HA Fluted X Carry 3.9in Guide Rod Assembly is compatible with? The manufacturer says that Herrington Arms HA Fluted X Carry 3.9in Guide Rod Assembly is compatible with SIG Sauer P320Herrington Arms HG-320-CARRY: HA Fluted X Carry 3.9in Guide Rod Assembly Black