Wilson Combat Sig Sauer WCP320 Full-Size Guide Rod Stainless. Crafted from hardened stainless steel it's precision machined and completed with a bead-blasted finish. Additionally its profile enables you to easily customize the recoil impulse of your gun using standard 1911 springsperfect for achieving optimal performance when shooting different kinds of ammo Specifications for Wilson Combat Sig Sauer WCP320 Full-Size Guide Rod: Manufacturer: Wilson Combat Color: Stainless Finish: Plain Fabric/Material: Steel Gun Make: SIG Sauer Gun Model: SIG Sauer P320 Full Size Features of Wilson Combat Sig Sauer WCP320 Full-Size Guide Rod Machined from solid stainless steel with a bead blast finish Fits full size 320 models and variants like the WCP320 (Not compatible with X5 models or Carry Compact or Subcompact models) Uses common 5 full-size 1911 recoil springs-recommended springs listed below They recommend a 14# spring (# 703G-14) for standard velocity/target loads and a 15# spring (# 10G15) for standard/+P. Package Contents: Wilson Combat Sig Sauer WCP320 Full-Size Guide Rod What firearm models does the manufacturer say Wilson Combat Sig Sauer WCP320 Full-Size Guide Rod is compatible with? The manufacturer says that Wilson Combat Sig Sauer WCP320 Full-Size Guide Rod is compatible with SIG Sauer P320 Full SizeWilson Combat 320-GRS: Sig Sauer WCP320 Full-Size Guide Rod Stainless