I have a trade proposition before me that I'm pretty excited about but would like input on what I'm trading for. Trade is straight across, no money either way to make up the difference on my part. Trading a Colt LEO AR6520 for a Izzy HB built on a Gear Logo Imbel receiver with an Izzy HB excellent parts kits, built 8 yrs. ago still has original parkerized finish. I won't be AR-less trading the Colt. Are there any issues with the Izzy HB, other than expensive parts for replacement?