Hi folks. I got my AR kit put together in the last few weeks pics on their way. I have a weaver 2x10x38 scope on it with a small red dot on top of it. I am thinking of getting either a saddle stock to go on it or an attachmet which turns my std. 6 pos. stock into one that they sell on amizon. Are they any good? how well do they improve cheek weld or are they junk?