The Strike Industries JitterPlug is a drop-in component that installs in a stock polymer guide rod for compact and full-size Glocks. Installed between the guide rod and the front of the lower locking lugs, the SI-GJP increases spring tension on the barrel and slide, improving lockup feel and removing that annoying Glock barrel rattle.FeaturesStainless steel constructionTightens lockup of barrels and slide, potentially increasing shot repeatabilityImproves feel of the actionEasy installation and removal DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.