I have compared the spring tension on the G20 to the spring tension of several other weapons including an XDS, XD tactical, M&P40, etc. the Glock had the least tension by quite a noticeable bit. I am thinking this is the problem. I feel it would be to my advantage to speak with CS and ask their direction. certainly the simple thing would be to have them send me the parts and do the install at home. if, however the warranty will need satisfaction I will send it back. I have done several similar things with other pistols so it is not a big hairy deal.