i had a stainless/poly "all-weather" model from about 2000-2001 or so.. it was kind of fun, but .223/556 was readily available at less than $0.10 per round back then. you could easily afford to have "fun" with an inaccurate, inexpensive, less-reliable weapon system. nowadays, it would just be a total waste of ammo.
i got 6-4MOA, depending on ammo, and did have a broken extractor about 400 rounds into the weapon's life. aside from that, i never had any "jams" to speak of.. it would double-feed with KKK magazines, but KKK magazines- and anything else KKK makes- are complete and total pieces of hammered dog ****.