Re: Remington Model 7400 trouble's
I would not completely disassemble the gas system unless I were familiar with it. Getting it back together properly is a bit of a pain unless you've done it before. To really clean this rifle properly, the bbl has to be removed and the bolt and action arm taken out. Some folks have tried to remove the bbl nut will all types of tools that end up bending the action aarm bars which will retard the action operation afterwards. A proper tool is sold by brownellls and will fit both sizes of bbl nut. I would remove the forearm leaving everything else alone and clean the tube, spring and arms as best I could. Pull the chrg hndl to the rear and clean the action with a toothbrush or other means as best you can. If you have forced air, blow out all the cleaner you can then apply oil (I use RemOil), give it a good shot then blow out all of that you can so it does not pool. Reassemble and test. If you feel you have to completely take the rifle apart, and remove the bbl, I will give you detailed instructions but that is seldom needed in all but the worst circumstances.