What is I just wanna add the full length mag tube and mag follower? Still 4 parts I have to replace? I have the 11707 model. Trying to keep it basic, I love the buttstock on it now, fits me perfectly. Plus I do have $300+ the c-stock right now. so really I just want the full length mag, mount a flashlight, a side saddle. Any recommendations on a side saddle? My best friend is on a swat team. He uses the m2 super 90 and put a 3gun gear side saddle on it.