Is there some kind of a smoke detector that either sounds off when exposed to cigarette smoke or that measures the level of cigarette smoke?Alternatively, is there something like litmus paper that turns a different color when exposed to cigarette smoke?
Nobody can give you the exact locking shoulder you need for your rifle. They make different sizes for a reason. Depending upon what kind of parts you have in your rifle, and what receiver your rifle has will determine what locking shoulder you need. There is nothing etched in stone here. Most likely you will have to install the middle of the road sized locking shoulder and have the rifle headspaced. If you are really lucky, the headspace will be fine. If not, you will then be able to determine weather you need to go bigger or smaller. Didn't your kit come with a locking shoulder? Sorry there is no easy answer for you.
You have to hit them really slowly, like 2 mph, I see people going like 20 over them and then asking questions like this. Also don't get mad when someone doesn't give you the exact answer, because there could be any number of reasons, and we cannot see your car. Also most people on here are not mechanics. If you really wanted to know what Is wrong you would take it to a garage.
