Hey I have a basically new Sig Mcx 5.56 with less than 60 rds through it total. I have a lot of platforms and don't shoot as much so it hasn't seen much use at all. It has a Frankenstein slip trip already installed if you want to go the frt route. All you have to do is install your rare breed, partisan or Atrius and she will be good to go. This is adjustable gas so can also run supressed as well. I have a wide selection of frt available as well If you want me to install one for you for a extra fee. As well as optic choices too. I even have picitanny mounts as well. Looking for $2000 cash or $2600 trade value. If interested text 2one6-2nine6-3867 thanks.