I would get one... if I had a 5.56 AR
As it is, I find a great deal of utility in the 22 long rifle sub caliber kit in my PTR91. It is good for training in the manual of arms, point shooting, etc.
I think I may get one of the 22 long rifle versions of the SIG556 here one of these days soon, as the cost of 5.56 and 7.62 is becoming too dear to shoot a whole lot of.
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