Recently built two AR rifles. One for keepin and one for sellin. On mine I put a JPSCS system in it, I use them/it on all my rifles. The one for sale I used the regular type buffer and spring. Went to the range with both in tow and fired them. I have forgotten what the clatter, the kick and all that slap was like. In firing the two almost identical rifles side by side I quickly remembered why I have and do use the silent capture spring in all my rifles. There is a difference between night and day with it and with out it. I did not put one of the rifle for sale to keep the cost down a bit but after firing them both I bought yet another one and put it on the rifle I am selling. For me it is something my AR/s can not do without. The smoothness and the greatly reduced noise and slap and all that is so much reduced it is really something else. So,,, if you ever build a rifle or ever buy one part for your existing rifle spend the 130 bucks and get your self the JPSCS system for your rifle, trust me you will not regret it and once you do you will want it to be a part of every AR you own. JUST AN FYI!! BANG BANG!!!!