Description-  The Herrington Arms guide rod assembly works flawlessly with X Carry 3.9" 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 our compensators, as well as tricky ammunition like frangible or hand loaded ammo.  Our P320 compensators can be found HERE! FULL KIT (12,14,16,18lb springs) 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.  Each FULL Kit includes: 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 WE HAVE DONE TESTING AND ALL THE SPRINGS CAN BE USED FOR OUR COMPENSATORS BUT THE 12 AND 14 POUND HAVE THE BEST EJECTION PATTERN