Here is the phone number for CPI; (801) 829-5877. Give them a call, and tell them about your problem. You may have to ride their asses, to get them to do something!!! They should issue a recall shipping ticket for you, but you will be without silencers for at least 2 weeks. They want the old ones back, to inspect, before they ship out the new ones. You can get silencers faster, if you want to pay CPI $120, which they should refund, once they get the screwed up ones back. I went through all of this crap, and it was a PITA, but I finally got a "decent" set of silencers.