Yea,a 20 comes into it's own for the longer shoots if your into that. But most club shoots around the country are 300m and under so don't feel you need a 20" to play or win.
You also have to consider if it's your only ar and if your going to use it for other things-most people with a sr class ar have another for hunting/3gun. If your only going to have one ar(yea right-they multiply like rabbits) I personally wouldn't make it conform to sr class rules as open/tactical are large and growing classes and having free float hand guards etc really helps for busting bunnys,goats etc-don't forget that sr class also governs what ammo you can use so if you just want to load/buy one load and sight in for it for hunting as well as range play your going to be in open even if your rifle is 100% service class.
There is no need to over think it- build/buy the gun you want and you will be very welcome at service events-at club level the classes matter very little to most people. Shoot and have fun
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