Well first let me write about the good things We owned two older Mech Tech carbine conversion units . MechTech - Home Mine is a .45 1911 unit. I've used this in 3 gun and Steel Challenge match without ever any problems, using major power loads for 3 gun and really light bullseye shooters loads for Steel Challenge. The wife's was a Glock 17 CCU. After she started to have problems with stove pipes and me going on the Mech-Tech forum to ask why. It was suggested by the moderator / engineer / designer of the unit to send it in for a look at. I paid for shipping with insurance and signature required to them. When the unit was ready they called for my credit card # for return shipping. I assumed they took out shipping with insurance & signature required as I had done. After awhile the stove pipes started again. So again I shipped the unit back to them, paying again for shipping with insurance and a signature. After some time I called to ask when my unit would be ready. I was told it was shipped and delivered to my front door by Fed-X. I told them that it wasn't there. I complained that I wasn't notified by anyone that the unit was being shipped. I called Fed-X to see if they delivered to the wrong address. The answer was no, the driver knew my house. It was delivered on a day we were away. When I asked why they left it, I was told that Mech-Tech hadn't required a signature upon delivery. And also Mech-Tech didn't take out any insurance which covers lose in transit. But this wasn't my problem, it was delivered to the house, so Fed-X's responsibility ends there. I called Mech-Tech back to see what they were going to do for me, since they didn't notify me before shipping with a tracking number. I requested they replace my unit. They told me no. They told me that they always ship without insurance or a signature required unless the customer is willing to pay for it. I explained I never was given that choice. I was told it was delivered, and since Fed-X wasn't going to reimburse them, neither would they reimburse me. So if you intend to buy one of their units or are sending one in for repair make sure for shipping to you, you request insurance, a signature required, and to have the carrier (Fed-X) send you a tracking number. None of which I and I'm reading others ever got. And get it in writing from them.