SOld to pjenk63. I am willing to part this out. Shoot me an offer with what you need.
I have an Adams Arms/Huldra Marked factory piston conversion kit. It is in very good shape. It has a PINNED front gas block with FSB spacing for the pins. The BCG includes a 5.45 bolt. If you want to use this on a 5.56 you can use any 5.56 bolt, just remove the gas rings and install the included spring. You will also need to buy the $14 gas tube hole upper receiver shim from Adams Arms to use on a normal upper. $195.00 shipped. Con US only. Paypal with no gun words or USPS MO. Email works best. Thanks, Jim