Greetings everyone... I'm new here and I just recently bought a NIB Sig 556 Swat. I'm not new to guns but this is the first time I've had a Sig... I really like it and I like the fact that it looks different than AR... and I also like the fact that it is a piston driven action. I took the rifle out on Memorial Day and shot it for the first time. First thing I noticed was how smooth the action seemed. Low recoil and you don't here that AR "Spoing" sound when fired. I was shooting 55gr FMJ that I had gotten from Georgia Arms. After about 150 - 200 rounds or so, the rifle had several FTF... the bolt would seem catch the next round about half way up the casing. It gave me the impression that the bolt carrier group wasn't going back far enough to feed the next round properly. I adjusted the gas piston to the "fouled" setting and the rifle functioned fine. I will say that before I went shooting that I did apply a little more lube to select spots as it appeared as though not enough was applied from the factory. I added Lithium grease where grease was applied originally. In looking back I wonder if adding the lithium grease to what was already there was a good idea as it may have been too much and that may have cause it to gum up and cause FTF's... When I cleaned it after shooting it, I did notice some very fine metal shavings... and immediately thought..."that's not good". It wasn't a lot but it was definitely noticable. I took my time cleaning the rifle trying to notice anything out of the ordinary especially after having seen fine metal shavings. I field stripped the rifle even down to taking the gas tube out. Cleaned out the receiver, bolt and bolt carrier. The piston head was fouled and residue was was on the top portion of the piston rod. I used CLP to clean it and wipe it down. After cleaning I was very liberal in applying lube. I used no grease this time.... I had cleaned the rifle with CLP and the wiped it all off and lubed it with some Militech Gun oil (really good stuff BTW) and as I said I was liberal with it. Once the rifle was back together I cycled the actionabout 75 time to work in the lube. It seemed fine but I did notice that the bolt seemed to lightly stick when it was about 80% back and would hang there. I could just very lightly tap it and it would go forward into battery. I tried to see if I could see what was causing it to bind but could see nothing. I even removed the bolt carrier and checked it again. It "seems" OK. Got it all together and put away for the night. Today I got the rifle and cycled it several times and it seemed to cycle smoothly but I still notice that sticking point ever so slightly... it didn't actually stick this time but maybe once or twice. I think letting the lube soak in really good overnight helped it. I was wondering if what I have experienced thus far is normal for this rifle or do you guys think there might be a problem? Any help or advice would be greatly appreciated. I have included a couple of pics of the rifle and the place at where the bolt was sticking.....
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