These are the first things that come to mind, hope it helps.Air Rifles + Air Arms Airforce Beeman Benjamin Sheridan Cometa. No bubbles would point towards a bad pump cup. You can put the muzzle under water and work the pump (make sure the bolt is closed) if it blows bubbles out the end of the barrel the valve is leaking the air out and needs to be looked at (bad exhaust valve or check valve). If there isn't much or no resistance while you pump it up it's either the pump cup or the valve. Look for anything that could keep the hammer from hitting the valve hard enough to open it. While you have it apart check to make sure the hammer slides free and hits the exhaust valve, take a look at the spring. To check to see if the valve is holding air I use a wood dowel that will reach in the tube from the rear and tap it with a hammer to release the air. If you feel resistance when pumping then I suspect #2 and you are going to have to open it up again. A few thoughts, 1) Are you sure the valve is holding air? Does it get harder to pump the more you pump it? 2) There could be to much air pressure in the valve and the hammer doesn't have enough power to overcome the air pressure. The 2100 can be a juggling act to get back together. There were enough parts to bolt together to make sure it was shootable and it has turned out to be a good shooter so far. I'm not saying the 766 is better than the 2100 just that the 2100 is less expensive to make and the reason you can get a 600+ fps pumper that will put pellets inside a dime at 10 yards for around $60. There are some differences, most of which seem to be to make production easier and cheaper. A lot of the parts for the 2100 have a 766 prefix, it was nice of Crosman to continue to use the same parts through the years otherwise it would be much more difficult to find the parts I need. I am ordering parts from the parts list for a late model 2100. Parts are no longer available from Crosman as they quit making this version of the 766 in 1981. My rifle is the second variant of the 766. The third version was renamed and became the 2100 in 1983. The second variant had a tapered metal barrel housing and the third variant had a straight metal barrel housing. There are three variants of the 766, the first version had a tapered plastic barrel housing.
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