Since I will be coming home from deployment in a bit and well this whole thing going off with EBR's I think I may bite the bullet on an AR with deployment cash. I have decided to look into building a rifle. I'm handy enough and while I will be coming off a deployment I'm sure my wife will still want time to herself and I need something to occupy my time with at night and the weekends. In comes an AR build.
I am a lefty and would like to have a weapon I can enjoy shooting unlike my M4 I am carrying around now. My one of many questions is gas piston system. Is that available on an AR build? I would also like to have the capablity of .223 and .22 for one, by only switching out the upper. Is that possible? This rifle will mainly be used for the range and plinking. Optics will be a must as for what not sure yet. Probably change between a decent scope and an eotech or something like that.
Cliff notes:
Will be used for range days and SHTF
Must be lefty
.223 and .22 change out
Gas piston possible?