Volquartsen Mark IV Bedding GelIncrease your Mark IV's accuracy and reliability with Volquartsen's custom-designed new Mark 4 Bedding Gels. It has an adhesive backing for easy installation and works to eliminate any play between the frame and upper. These gels are made from Technogel, which allows the product to conform to any frame and upper combination and ensures perfect lockup every time you assemble your pistol.Each pack comes with TWO gels.MPN: VC4BGUPC: 810162017446