I bought one last Sunday at a Gun Show in Decatur, AL. The young man that is President of the company was there demonstrating and selling them. We had a very long talk about them with me asking dozens of questions and he knowledgeably, politely and respectfully answering everything. It was a pleasure talking with him. Now, I got it home and didn't shoot it until Thursday. Thursday I only did a function test. I installed it in my S&W M&P 15. It is super easy to install and can be converted from .223 to 22LR in less than 30 seconds.. After installation the instructions say to pull the charging handle and release it (without riding the handle back down) several times. I did that and put a little oil on the bolt rails. I then did the function test. I was using Federal Auto Match ammo that they recommend and sell. They recommend using ammo with a velocity >1000 fps. And to stay away from the Remington Thunderbolts. I was very disappointed. It would not fire a complete magazine without misfires. Anyway, I tried 2 different magazines, loaded several times, and was having more FTF's than rounds that did fire. Most of the FTF's would fire the second time around though. So I called the company and the young man, company president, answered the phone. I explained what was happening and he said occasionally the kits do not mate well with a particular AR but he would make it right. He sent me a completely new kit that day. I received it the next day, Friday. WOW! That was fast! Enclosed was a prepaid return label for the original kit. I got to test fire the new kit today. It fired flawlessly. Never missed a beat. I don't know how you may feel about this. I expect things to work right straight out of the box. If it doesn't I'm very disappointed. BUT, if a company offers the customer service that Tactical Industries does, then I can give them a break and a second chance. Based upon the Customer Service alone I would recommend them.