They are absolute crap...
I've owned 2 of them...
First one was nothing but problems, so I returned it to my dealer for a refund...
About a year later, I figured the problems with the first one must have been a fluke, so I bought another one...
Big mistake...
The bolt broke in half after ONLY 2 shots from a brand new gun...
Not wanting to give-up as easy this time, I replaced te bolt with a spare USGI bolt that I modified to fit the POI barrel extension...
The gun still had problems...
I opened up and radiused the ejection port to match USGI specs, polished the feed ramps, installed a USGI bolt carrier, Heavy steel buffer, USGI buffer tube, Heavy Wolff buffer spring, installed an A2 stock, and replaced the extractor spring with a HD Wolff spring & D-fender O-ring...
After my 10-12 hours of gunsmithing, the gun worked great for about 400-500 rounds...
THEN, the gas tube broke/blew off the front sight base...
POI mailed me a new gas tube and bolt ONLY after I sent them the original broken parts...
They also were nice enough to write me a note saying any future warranty on the gun is completely voided due to my gunsmithing...
I put the gun back together in it's original configuration, and promptly traded it off at the gunshop...
I will never buy another, and will tell everyone I can about how much of a piece of shit and rip-off these guns are...