Jump on it. The Mac 11s are the "bargains" of the subgun world but usually go in the 3500 range or more. Suppressors don't hold much resale value, so it doesn't add much to the value of the pkg. Lots of accessories for them like slowfire uppers, .22 conversions, HK type sights, folder stocks, etc. Many of the uppers that mimic classic beltfeds use the MAC 11 registered receiver as the "lower" so you can have the functional equivalent of an MG42 or whatever for a few thousand versus the $25K+ an original will cost.