Buy It Cheap!
Stack It Deep!
Bleh.... that thing looks like something that came out of a coyotes craphole.
Guess i'll need to find a nice used 556 if I still want a Sig down the road.
I have a sig 551-a1 so if the articles are correct these uppers will fit, but a ak mag will not nor will a ar mag
but I have a sig 556 lower I picked up for ar mags conversion, if i chose, I could swap out or add one of these conversion uppers, except the ak mags would have to be after market ar style 7.62 x39mm mags
the only other draw back is that the uppers on sigs are serial numbered and therefore a FFL item??????????? big draw back for me
Sprat and sprat1 are one and the same.